Debt Disclosure [Abstract] Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] Guarantee Entity Name [Axis] Guarantee Entity Name [Axis] Guarantee Entity Name [Axis] Guarantee Entity Name [Domain] Guarantee Entity Name [Domain] Guarantee Entity Name [Domain] Kinder Morgan Energy Partners, L.P. Kinder Morgan Energy Partners, L.P. [Member] Kinder Morgan Energy Partners, L.P. [Member] Chevron Phillips Chemical Company, LP Chevron Phillips Chemical Company, LP [Member] Chevron Phillips Chemical Company, LP [Member] All Other Guarantee Entities All Other Guarantee Entities [Member] All Other Guarantee Entities [Member] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Payment Guarantee Payment Guarantee [Member] Indemnification Agreement Indemnification Agreement [Member] Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] BNSF Railway Ownership Percentage Noncontrolling Interest, Ownership Percentage by Parent Principal Amount Guaranteed Principal Amount Guaranteed Principal Amount Guaranteed Maximum Future Payments Guarantor Obligations, Maximum Exposure, Undiscounted Maximum Recourse Amount Maximum Recourse Amount Maximum Recourse Amount Remaining Term (in years) Remaining Term Remaining Term Capitalized Obligations Guarantor Obligations, Current Carrying Value New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Pronouncements Description of New Accounting Pronouncements Not yet Adopted [Text Block] Schedule of Operating Leased Assets [Table] Schedule of Operating Leased Assets [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Parties to Contractual Arrangement [Axis] Parties to Contractual Arrangement [Axis] Parties to Contractual Arrangement [Domain] Parties to Contractual Arrangement [Domain] Reporting Entity [Member] Reporting Entity [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Equipment [Member] Equipment [Member] Operating Leased Assets [Line Items] Operating Leased Assets [Line Items] Future minimum lease payments Operating Leases, Future Minimum Payments Due Debt, fair value Long-term Debt, Fair Value Debt, book value Long-term Debt Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block] Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] Other Intangible Assets and Liabilities Goodwill And Other Intangible Assets and Liabilities [Text Block] Goodwill And Other Intangible Assets and Liabilities [Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock and Paid-in Capital Common Stock Including Additional Paid in Capital [Member] Retained Earnings Retained Earnings [Member] InterCompany Notes Receivable InterCompanyNotesReceivable [Member] InterCompanyNotesReceivable [Member] Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss) [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Stockholders' Equity Attributable to Parent Change in intercompany notes receivable Increase (Decrease) in Notes Receivable Classified as Equity, Related Parties Increase (Decrease) in Notes Receivable Classified as Equity, Related Parties Comprehensive income, net of tax Comprehensive Income (Loss), Net of Tax, Attributable to Parent Balance OCI Parenthetical [Abstract] OCI Parenthetical [Abstract] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Change in amortization of accumulated actuarial losses tax benefit (expense) Change In Unrecognized Prior Service Credit And Actuarial Losses Tax Benefit (Expense) Change In Unrecognized Prior Service Credit And Actuarial Losses Tax Benefit (Expense) Change in fuel hedge mark-to-market, tax expense/(benefit) Fuel Interest Hedge Mark To Market Tax (Benefit) Expense The net tax (benefit) expense resulting from the change in accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges, net of tax effect. Commitments and Contingencies Disclosure [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Current Liabilities Current Liabilities [Member] Current Liabilities [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Unasserted Claim Unasserted Claim [Member] Personal Injury Personal Injury [Member] Personal Injury [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Asbestos and Personal Injury [Abstract] Loss Contingency, Estimate [Abstract] Percent of future unasserted asbestos claims to be filed within the next ten years Percent of Future Unasserted Asbestos Claims To be Filed Within the Next Ten Years Percent of Future Unasserted Asbestos Claims To be Filed Within the Next Ten Years Percent of future unasserted asbestos claims to be filed within the next fifteen years Percent of Future Unasserted Asbestos Claims to be Filed Within the Next Fifteen Years Percent of Future Unasserted Asbestos Claims to be Filed Within the Next Fifteen Years Percent of future unasserted asbestos claims to be filed within the next twenty-five years Percent of Future Unasserted Asbestos Claims to be Filed Within the Next Twenty-five Years Percent of Future Unasserted Asbestos Claims to be Filed Within the Next Twenty-five Years Length in years for 60 percent of future unasserted asbestos claims to be filed Length in Years for 60 Percent of Future Unasserted Asbestos Claims to be Filed Length in Years for 60% of Future Unasserted Asbestos Claims to be Filed Length in years for 80 percent of future unasserted asbestos claims to be filed Length in Years for 80 Percent of Future Unasserted Asbestos Claims to be Filed Length in Years for 80 Percent of Future Unasserted Asbestos Claims to be Filed Length in years for 95 percent of future unasserted claims to be filed Length in Years for 95 Percent of Future Unasserted Claims to be Filed Length in Years for 95 Percent of Future Unasserted Claims to be Filed Accrued obligations for asbestos and other personal injury matters, current liabilities Loss Contingency, Accrual Carrying Value, Current Future costs to settle personal injury claims, minimum Loss Contingency, Range of Possible Loss, Minimum Future costs to settle personal injury claims, maximum Loss Contingency, Range of Possible Loss, Maximum Loss Contingency Accrual [Roll Forward] Loss Contingency Accrual [Roll Forward] Beginning balance Loss Contingency Accrual, at Carrying Value Accruals Loss Contingency Accrual, Carrying Value, Provision Payments Loss Contingency Accrual, Carrying Value, Payments Ending balance Schedule of Loss Contingencies by Contingency Schedule of Loss Contingencies by Contingency [Table Text Block] Accrual for Environmental Loss Contingencies Accrual for Environmental Loss Contingencies [Table Text Block] Accrual for Environmental Loss Contingencies [Table Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entities [Table] Entities [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Fuel Derivative Instruments and Hedging Activities Disclosure [Text Block] Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, net Accounts Receivable, Net, Current Materials and supplies Materials, Supplies, and Other Current portion of deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Current Other current assets Other Assets, Current Total current assets Assets, Current Property and equipment, net of accumulated depreciation of $1,717 and $1,623, respectively Property, Plant and Equipment, Net Goodwill Goodwill Intangible assets, net Finite-Lived Intangible Assets, Net Other assets Other Assets, Noncurrent Total assets Assets LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable and other current liabilities Accounts Payable and Accrued Liabilities, Current Long-term debt due within one year Long-term Debt and Capital Lease Obligations, Current Total current liabilities Liabilities, Current Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Long-term debt Long-term Debt and Capital Lease Obligations Intangible liabilities, net Intangible liabilities, net The aggregate sum of gross carrying value of a major finite-lived intangible liability class, less accumulated amortization and any impairment charges. Pension and retiree health and welfare liability Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent Casualty and environmental liabilities Casualty and environmental liabilities Noncurrent portion of costs accrued as of the balance sheet date for casualty, environmental and other loss contingencies. Other liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (see Notes 6 and 7) Commitments and Contingencies Stockholder’s equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, $1 par value, 1,000 shares authorized; issued and outstanding and paid-in-capital Common Stock, Including Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Intercompany notes receivable Notes Receivable, Related Parties, Noncurrent Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholder’s equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and stockholder's equity Liabilities and Equity Insurance [Table] Insurance [Table] Insurance [Table] Affiliated Entity Affiliated Entity [Member] BNSF Insurance Company BNSF Insurance Company [Member] BNSF Insurance Company [Member] Insurance [Line Items] Insurance [Line Items] Insurance [Line Items] Insurance coverage premiums Premiums Written By Related Insurance Entity Net Of Reimbursements Premiums written by related insurance entity, net of reimbursement form third parties Expense related to insurance premiums General Insurance Expense Related Insurance Entity The expense in the period incurred with respect to protection provided by related insurance entity against risks other than risks associated with production (which are allocated to cost of sales). Unamortized insurance premiums Prepaid Insurance Written By Related Insurance Entity Carrying amount as of the balance sheet date of unamortized costs of insurance coverage written by related insurance entity, which will be charged against earnings ratably over the period in which contractually agreed upon coverage's will be in effect; such periods expire within one year or the normal operating cycle, if longer. Insurance claims paid Claim Payments Made By Related Insurance Entity To Related Subsidiary Total amount of payments made by related insurance entity to related subsidiary during the reporting period to settle insured claims. Insurance claims receivable Insurance Settlements Receivable From Related Insurance Entity Amount due in settlement of a claim for reimbursement from related insurance entity when the Company has suffered a loss covered under an insurance policy. Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Amortized intangible assets, gross carrying amount Finite-Lived Intangible Assets, Gross Amortized intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Amortized intangible liabilities, gross carrying amount Finite-Lived Intangible Liabilities, Gross Amount before amortization of liabilities, excluding financial liabilities, lacking physical substance with a finite life. Amortized intangible liabilities, accumulated amortization Finite-Lived Intangible Liabilities, Accumulated Amortization Finite-Lived Intangible Liabilities, Accumulated Amortization Amortization of intangible assets Amortization of Intangible Assets Amortization of intangible liabilities Amortization of Intangible Liabilities Amortization of Intangible Liabilities Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Amortization of intangible assets, Remainder of 2013 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Amortization of intangible liabilities, Remainder of 2013 Finite-Lived Intangible Liabilities, Amortization Expense, Remainder of Fiscal Year Finite-Lived Intangible Liabilities, Amortization Expense, Remainder of Fiscal Year Amortization of intangible assets, 2014 Finite-Lived Intangible Assets, Amortization Expense, Year Two Amortization of intangible liabilities, 2014 Finite-Lived Intangible Liabilities, Amortization Expense, Year Two Finite-Lived Intangible Liabilities, Amortization Expense, Year Two Amortization of intangible assets, 2015 Finite-Lived Intangible Assets, Amortization Expense, Year Three Amortization of intangible liabilities, 2015 Finite-Lived Intangible Liabilities, Amortization Expense, Year Three Finite-Lived Intangible Liabilities, Amortization Expense, Year Three Amortization of intangible assets, 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Four Amortization of intangible liabilities, 2016 Finite-Lived Intangible Liabilities, Amortization Expense, Year Four Finite-Lived Intangible Liabilities, Amortization Expense, Year Four Amortization of intangible assets, 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Five Amortization of intangible liabilities, 2017 Finite-Lived Intangible Liabilities, Amortization Expense, Year Five Finite-Lived Intangible Liabilities, Amortization Expense, Year Five Comprehensive Income Comprehensive Income (Loss) Note [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Other Assets Other Asset, Investment in Variable Interest Entity [Text Block] Other Asset, Investment in Variable Interest Entity [Text Block] Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Cost of Fuel Cost of Fuel [Member] Cost of Fuel [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Operating Expense Operating Expense [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Fuel costs percent of total operating expenses Concentration Risk, Percentage Compensation and Retirement Disclosure [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Pension Plans, Defined Benefit Pension Plans, Defined Benefit [Member] Other Postretirement Benefit Plans, Defined Benefit Other Postretirement Benefit Plans, Defined Benefit [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Environmental Issue Environmental Issue [Member] Site Contingency, Estimated Time Frame for Accrued Cost Distributions Site Contingency, Estimated Time Frame for Accrued Cost Distributions Site Contingency, Estimated Time Frame for Accrued Cost Distributions Number of alleged environmental contamination sites (in sites) Administrative Judicial and Other Mandatory Cleanup Efforts Total Sites Administrative, Judicial and Other Mandatory Cleanup Efforts, Total Sites Number of environmental superfund sites (in sites) Administrative Judicial and Other Mandatory Cleanup Efforts Superfund Sites Administrative, Judicial and Other Mandatory Cleanup Efforts, Superfund Sites Liability for third-party environmental tort claims Recorded Liability For Third Party Environmental Tort Claims Recorded Liability For Third Party Environmental Tort Claims Accrued obligations for environmental matters, current liabilities Accrued Environmental Loss Contingencies, Current Future costs of environmental liabilities, minimum Future costs of environmental liabilities, maximum Accrual for Environmental Loss Contingencies [Roll Forward] Accrual for Environmental Loss Contingencies [Roll Forward] Beginning balance Accrual for Environmental Loss Contingencies Accruals Accrual For Environmental Loss Contingencies Provision Accrual For Environmental Loss Contingencies Provision Payments Accrual for Environmental Loss Contingencies, Payments Ending balance Net Cost Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Amortization of net loss Defined Benefit Plan, Amortization of Net Gains (Losses) Net cost recognized Defined Benefit Plan, Net Periodic Benefit Cost Discretionary contribution by Company Defined Benefit Plan, Contributions by Employer Schedule of Equity Method Investments [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Company limited partner holding interest, percentage Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage General partner holding interest, percentage Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Assets of unconsolidated Partnership Variable Interest Entity, Assets Variable Interest Entity, Assets Unamortized investment balance classified as Other Assets Variable Interest Entity, Nonconsolidated, Unamortized Investment Balance Variable Interest Entity, Nonconsolidated, Unamortized Investment Balance Remaining commitments classified as Other Liabilities Other Commitment Maximum exposure to loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Remaining commitments due at the end of 2013 Other Commitment, Due in Second Year Debt Debt Disclosure [Text Block] Receivables [Abstract] Allowance for bill adjustments and uncollectible accounts Allowance for Bill Adjustments and Doubtful Accounts Receivable, Current A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that have bill adjustments or are expected to be uncollectible. Accounts receivable greater than 90 days old Accounts Receivable, Current, Greater than 90 Days Past Due Accounts Receivable, Current, Greater than 90 Days Past Due Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Northern Sante Fe Corporation [Member] Northern Sante Fe Corporation [Member] Northern Sante Fe Corporation [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Acquired remaining oustanding shares, percentage Business Combination, Step Acquisition, Remaining Equity Interest Acquired, Percentage In a business combination achieved in stages, this element represents the percentage aquired of the remaining equity interest in the acquiree not already owned. Accounting Policies and Interim Results Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Schedule of Finite-Lived Intangible Assets and Liabilities Schedule of Finite-Lived Intangible Assets and Liabilities [Table Text Block] Schedule of Finite-Lived Intangible Assets and Liabilities [Table Text Block] Schedule of Finite-Lived Intangible Assets and Liabilities Amortization Expense Schedule of Finite-Lived Intangible Assets and Liabilities Amortization Expense [Table Text Block] Schedule of Finite-Lived Intangible Assets and Liabilities Amortization Expense [Table Text Block] Schedule of Finite-Lived Intangible Assets and Liabilities, Future Amortization Expense Schedule of Finite-Lived Intangible Assets and Liabilities, Future Amortization Expense [Table Text Block] Schedule of Finite-Lived Intangible Assets and Liabilities, Future Amortization Expense [Table Text Block] Income Statement [Abstract] Revenues Revenue, Net Operating expenses: Operating Expenses [Abstract] Compensation and benefits Labor and Related Expense Fuel Fuel Costs Purchased services Purchased services The amount of expense for contract services provided to the Company. Depreciation and amortization Depreciation, Depletion and Amortization Equipment rents Equipment rents Rent paid for freight cars owned by other railroads or private companies, net of rents received, including lease expenses primarily for locomotives, railcars, containers and trailers. Materials and other Materials and other Materials and other operating expenses not separately disclosed. This element is used when other, more specific, elements are not appropriate. Total operating expenses Operating Expenses Operating income Operating Income (Loss) Interest expense Interest and Debt Expense Interest income, related parties Interest Income Related Parties Interest income received from related parties. Other expense, net Other Nonoperating Income (Expense) Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net income Net Income (Loss) Attributable to Parent Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Stockholders' Equity: Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Consolidated Statement of Comprehensive Income [Abstract] Consolidated Statement of Comprehensive Income [Abstract] Net income Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in amortization of accumulated actuarial losses, net of tax expense of $2 million and $2 million, respectively Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax Change in fuel hedge mark-to-market, net of tax benefit of $0 million and $4 million, respectively Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Change in accumulated other comprehensive income of equity method investees Change in Other Comprehensive Income of Equity Method Investees Change in Other Comprehensive Income of Equity Method Investees Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Total comprehensive income Accumulated Other Comprehensive Income [Table] Accumulated Other Comprehensive Income [Table] Accumulated Other Comprehensive Income [Table] Accumulated Other Comprehensive Income Loss Axis [Axis] Accumulated Other Comprehensive Income Loss Axis [Axis] Accumulated Other Comprehensive Income Loss Axis [Axis] Accumulated Other Comprehensive Income Loss Axis [Domain] Accumulated Other Comprehensive Income Loss Axis [Domain] [Domain] for Accumulated Other Comprehensive Income Loss Axis [Axis] Equity Method Investments [Member] Equity Method Investments [Member] Accumulated Other Comprehensive Income [Line Items] Accumulated Other Comprehensive Income [Line Items] Accumulated Other Comprehensive Income [Line Items] Accumulated Other Comprehensive Income Loss [Roll Forward] Accumulated Other Comprehensive Income Loss [Roll Forward] Accumulated Other Comprehensive Income Loss [Roll Forward] Accumulated Other Comprehensive Income (Loss), Beginning Balance Other Comprehensive Income Loss Before Reclassifications Other Comprehensive Income Loss Before Reclassifications Amount before reclassification adjustments of increase (decrease) in accumulated other comprehensive income (loss). Amounts Reclassified From Accumulated Other Comprehensive Income Loss Amounts Reclassified From Accumulated Other Comprehensive Income Loss Amounts Reclassified From Accumulated Other Comprehensive Income Loss Accumulated Other Comprehensive Income (Loss), Ending Balance Reclassifications Out of Accumulated Other Comprehensive Loss [Abstract] Reclassifications Out of Accumulated Other Comprehensive Loss [Abstract] Reclassifications Out of Accumulated Other Comprehensive Loss [Abstract] Actuarial losses Change In Unrecognized Prior Service Credit And Actuarial Losses Tax Benefit (Expense) Employment Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Variable Debt Rate Type [Axis] Variable Debt Rate Type [Axis] Variable Debt Rate Type [Axis] Variable Debt Rate Type [Domain] Variable Debt Rate Type [Domain] Variable Debt Rate Type [Domain] Effective Federal Funds Rate [Member] Effective Federal Funds Rate [Member] Effective Federal Funds Rate [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Parent Company Parent Company [Member] Berkshire and its subsidiaries Berkshire and its subsidiaries [Member] Berkshire and its subsidiaries [Member] BNSF Logistics BNSF Logistics [Member] BNSF Logistics [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Federal and state income payments, net of refunds Income Tax Payments, Net of Refunds, To Parent By Reporting Entity Income Tax Payments, Net of Refunds, To Parent By Reporting Entity Intercompany receivables Accounts Receivable, Related Parties, Current Intercompany payables Accounts Payable, Related Parties, Current Intercompany notes receivable Change in intercompany notes receivable Increase (Decrease) in Notes Receivable, Related Parties Origination of Notes Receivable from Related Parties Origination of Notes Receivable from Related Parties Repayments received on intercompany notes receivable Repayment of Notes Receivable from Related Parties Intercompany notes variable interest rate Debt Instrument, Basis Spread on Variable Rate Revenues from Related Parties Revenue from Related Parties Purchased truck transportation services Related Party Transaction, Purchases from Related Party Related Party Transaction Expenditures From Transactions With Berkshire and its subsidiaries Related Party Transaction Expenditures From Transactions With Berkshire and its subsidiaries Expenditures recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party, Berkshire and its subsidiaries. Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Statement of Cash Flows [Abstract] OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Deferred income taxes Deferred Income Tax Expense (Benefit) Long-term casualty and environmental liabilities, net Long term casualty and environmental liabilities, net The net change during the reporting period in the amount of noncurrent costs accrued for casualty, environmental and other loss contingencies. Contribution to defined pension plan Pension Contributions Other, net Other Operating Activities, Cash Flow Statement Changes in current assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable, net Increase (Decrease) in Accounts Receivable Materials and supplies Increase (Decrease) in Materials and Supplies Other current assets Increase (Decrease) in Other Current Assets Accounts payable and other current liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Capital expenditures excluding equipment Capital Expenditures Excluding Equipment The cash outflow associated with the acquisition of long-lived, physical assets, excluding equipment, that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Acquisition of equipment Acquisition of equipment The cash outflow associated with the acquisition of equipment which includes locomotive, freight cars and other equipment, some or all of which may be sold and leased back by the Company through either an operating or capital lease. Other, net Payments for (Proceeds from) Other Investing Activities Net cash used for investing activities Net Cash Provided by (Used in) Investing Activities FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Payments on long-term debt Repayments of Long-term Debt Net (increase) decrease in intercompany notes receivable classified as equity Other, net Proceeds from (Payments for) Other Financing Activities Net cash used for financing activities Net Cash Provided by (Used in) Financing Activities Decrease (Increase) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents: Cash and Cash Equivalents, at Carrying Value [Abstract] Beginning of period End of period SUPPLEMENTAL CASH FLOW INFORMATION Supplemental Cash Flow Information [Abstract] Interest paid, net of amounts capitalized Interest Paid, Net Capital investments accrued but not yet paid Capital Expenditures Incurred but Not yet Paid Income taxes paid, net of refunds Income Taxes Paid, Net Accounts Receivable, Net Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instrument Risk [Axis] Derivative Instrument Risk [Axis] Derivative Contract Type [Domain] Derivative Contract Type [Domain] Fuel Contracts Fuel Contracts [Member] Fuel Contracts [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Fuel Expense Fuel Expense [Member] Fuel Expense [Member] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Cash Flow Hedging Cash Flow Hedging [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Amount of Gain or (Loss) Recognized in Other Comprehensive Income (OCI) on Derivative (Effective Portion) Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Amount of Gain or (Loss) Recognized from AOCL into Income (Effective Portion) Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion Amount of Gain or (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule of Guarantor Obligations Schedule of Guarantor Obligations [Table Text Block]