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Consolidated Statements of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net of Tax $ 3,869us-gaap_NetIncomeLoss $ 3,793us-gaap_NetIncomeLoss $ 3,372us-gaap_NetIncomeLoss
Other comprehensive income:      
Change in Pension and Retiree Health and Welfare benefits, net of tax benefit of $156 million, tax expense of $305 million and tax benefit of $16 million, respectively (251)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax 492us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax (28)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Change in fuel hedge mark-to-market, net of tax benefit of $0 million, $0 million and $7 million, respectively 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (11)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Change in accumulated other comprehensive income (loss) of equity method investees 4bni_ChangeInOtherComprehensiveIncomeOfEquityMethodInvestees (2)bni_ChangeInOtherComprehensiveIncomeOfEquityMethodInvestees (3)bni_ChangeInOtherComprehensiveIncomeOfEquityMethodInvestees
Other comprehensive income (loss), net of tax (247)us-gaap_OtherComprehensiveIncomeLossNetOfTax 490us-gaap_OtherComprehensiveIncomeLossNetOfTax (42)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive income $ 3,622us-gaap_ComprehensiveIncomeNetOfTax $ 4,283us-gaap_ComprehensiveIncomeNetOfTax $ 3,330us-gaap_ComprehensiveIncomeNetOfTax