2.2.0.7 true Goodwill and Other Intangible Assets and Liabilities (Details) (USD $) 0605 - Disclosure - Goodwill and Other Intangible Assets and Liabilities (Details) true false In Millions false false 1 USD true false false false Successor us-gaap_StatementScenarioAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_SuccessorMember us-gaap_StatementScenarioAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ false 2 USD true false false false Predecessor us-gaap_StatementScenarioAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_PredecessorMember us-gaap_StatementScenarioAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 3 USD true false false false Predecessor us-gaap_StatementScenarioAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_PredecessorMember us-gaap_StatementScenarioAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ false 4 USD true false false false Predecessor us-gaap_StatementScenarioAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_PredecessorMember us-gaap_StatementScenarioAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ 5 Changes in the carrying amount of goodwill 3 us-gaap_GoodwillRollForward us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:stringItemType string A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. false 6 Beginning balance 4 us-gaap_Goodwill us-gaap true debit instant No definition available. false false false false false false false false true false false periodstartlabel false 1 true true false false 0 0 true false false 2 true true false false 0 0 true false false 3 true true false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:monetaryItemType monetary Carrying amount as of the balance sheet date, which is the cumulative amount paid, adjusted for any amortization recognized prior to adoption of FAS 142 and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 false 7 Additions 4 us-gaap_GoodwillAcquiredDuringPeriod us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 14803000000 14803 true false false 2 false true false false 0 0 true false false 3 false true false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:monetaryItemType monetary The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e(1) true 8 Ending balance 4 us-gaap_Goodwill us-gaap true debit instant No definition available. false false false false false false false false false true false periodendlabel false 1 false true false false 14803000000 14803 true false false 2 false true false false 0 0 true false false 3 false true false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:monetaryItemType monetary Carrying amount as of the balance sheet date, which is the cumulative amount paid, adjusted for any amortization recognized prior to adoption of FAS 142 and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 false 9 Amortized intangible assets and liabilities 3 bni_AmortizedIntangibleAssetsAndLiabilitiesAbstract bni false na duration Amortized intangible assets and liabilities. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:stringItemType string Amortized intangible assets and liabilities. false 10 Amortized intangible assets, Gross Carrying Amount 4 us-gaap_FiniteLivedIntangibleAssetsGross us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 2012000000 2012 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false true false false 0 0 true false false xbrli:monetaryItemType monetary Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) false 11 Amortized intangible assets, Accumulated Amortization 4 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 127000000 127 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false true false false 0 0 true false false xbrli:monetaryItemType monetary The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) false 12 Amortized intangible liabilities, Gross Carrying Amount 4 bni_AmortizedIntangibleLiabilitiesGross bni false credit instant Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible liabilities... false false false false false false false false false false false verboselabel false 1 false true false false 2056000000 2056 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false true false false 0 0 true false false xbrli:monetaryItemType monetary Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible liabilities having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible liability class. A major class is composed of intangible liabilities that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. No authoritative reference available. false 13 Amortized intangible liabilities, Accumulated Amortization 4 bni_AmortizedIntangibleLiabilitiesAccumulatedAmortization bni false credit instant The accumulated amount of amortization of a major finite-lived intangible liability class. A major class is composed of... false false false false false false false false false false false totallabel false 1 false true false false 115000000 115 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false true false false 0 0 true false false xbrli:monetaryItemType monetary The accumulated amount of amortization of a major finite-lived intangible liability class. A major class is composed of intangible liabilities that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. No authoritative reference available. true 14 Amortization of intangible assets and liabilities 3 bni_AmortizationOfIntangibleAssetsAndLiabilitiesAbstract bni false na duration Amortization of intangible assets and liabilities. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:stringItemType string Amortization of intangible assets and liabilities. false 15 Amortization of intangible assets 4 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 127000000 127 true false false 2 false true false false 0 0 true false false 3 false true false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:monetaryItemType monetary Aggregate amount of amortization expense recognized for intangible asset during the period. A recognized intangible asset shall be amortized over its estimated useful life to the reporting entity unless that life is determined to be indefinite. If an intangible asset has a finite useful life, but the precise length of that life is not known, that intangible asset shall be amortized over the best estimate of its useful life. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) false 16 Amortization of intangible liabilities 4 bni_FiniteLivedIntangibleLiabilitiesAmortization bni false credit duration Aggregate amount of amortization recognized for intangible liabilities during the period. A recognized intangible liability... false false false false false false false false false false false totallabel false 1 false true false false 115000000 115 true false false 2 false true false false 0 0 true false false 3 false true false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:monetaryItemType monetary Aggregate amount of amortization recognized for intangible liabilities during the period. A recognized intangible liability shall be amortized over its estimated useful life to the reporting entity unless that life is determined to be indefinite. If an intangible liability has a finite useful life, but the precise length of that life is not known, that intangible liability shall be amortized over the best estimate of its useful life. No authoritative reference available. true 17 Future amortization of intangible assets and liabilities 3 bni_FutureAmortizationOfIntangibleAssetsAndLiabilitiesAbstract bni false na duration Future amortization of intangible assets and liabilities. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:stringItemType string Future amortization of intangible assets and liabilities. false 18 Amortization of intangible assets, Remainder of 2010 4 bni_FutureAmortizationExpenseRemainderOfCurrentYear bni false debit instant The amount of amortization expense expected to be recognized during the remainder of the current year. false false false false false false false false false false false verboselabel false 1 false true false false 154000000 154 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:monetaryItemType monetary The amount of amortization expense expected to be recognized during the remainder of the current year. No authoritative reference available. false 19 Amortization of intangible assets, 2011 4 bni_FutureAmortizationExpenseYearFollowingCurrentYear bni false debit instant The amount of amortization expense expected to be recognized during the year following the current year. false false false false false false false false false false false verboselabel false 1 false true false false 307000000 307 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:monetaryItemType monetary The amount of amortization expense expected to be recognized during the year following the current year. No authoritative reference available. false 20 Amortization of intangible assets, 2012 4 bni_FutureAmortizationExpenseSecondYearFollowingCurrentYear bni false debit instant The amount of amortization expense expected to be recognized during the second year following the current year. false false false false false false false false false false false verboselabel false 1 false true false false 307000000 307 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:monetaryItemType monetary The amount of amortization expense expected to be recognized during the second year following the current year. No authoritative reference available. false 21 Amortization of intangible assets, 2013 4 bni_FutureAmortizationExpenseThirdYearFollowingCurrentYear bni false debit instant The amount of amortization expense expected to be recognized during the third year following the current year. false false false false false false false false false false false verboselabel false 1 false true false false 307000000 307 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:monetaryItemType monetary The amount of amortization expense expected to be recognized during the third year following the current year. No authoritative reference available. false 22 Amortization of intangible assets, 2014 4 bni_FutureAmortizationExpenseFourthYearFollowingCurrentYear bni false debit instant The amount of amortization expense expected to be recognized during the fourth year following the current year. false false false false false false false false false false false verboselabel false 1 false true false false 307000000 307 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:monetaryItemType monetary The amount of amortization expense expected to be recognized during the fourth year following the current year. No authoritative reference available. false 23 Amortization of intangible liabilities, Remainder of 2010 4 bni_FutureAmortizationOfIntangibleLiabilitiesRemainderOfCurrentYear bni false debit instant The amount of amortization of intangible liabilities expected to be recognized during the remainder of the current year. false false false false false false false false false false false verboselabel false 1 false true false false 151000000 151 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:monetaryItemType monetary The amount of amortization of intangible liabilities expected to be recognized during the remainder of the current year. No authoritative reference available. false 24 Amortization of intangible liabilities, 2011 4 bni_FutureAmortizationOfIntangibleLiabilitiesYearFollowingCurrentYear bni false debit instant The amount of amortization of intangible liabilities expected to be recognized during the year following the current year. false false false false false false false false false false false verboselabel false 1 false true false false 293000000 293 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:monetaryItemType monetary The amount of amortization of intangible liabilities expected to be recognized during the year following the current year. No authoritative reference available. false 25 Amortization of intangible liabilities, 2012 4 bni_FutureAmortizationOfIntangibleLiabilitiesSecondYearFollowingCurrentYear bni false debit instant The amount of amortization of intangible liabilities expected to be recognized during the second year following the current... false false false false false false false false false false false verboselabel false 1 false true false false 282000000 282 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:monetaryItemType monetary The amount of amortization of intangible liabilities expected to be recognized during the second year following the current year. No authoritative reference available. false 26 Amortization of intangible liabilities, 2013 4 bni_FutureAmortizationOfIntangibleLiabilitiesThirdYearFollowingCurrentYear bni false debit instant The amount of amortization of intangible liabilities expected to be recognized during the third year following the current... false false false false false false false false false false false verboselabel false 1 false true false false 252000000 252 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:monetaryItemType monetary The amount of amortization of intangible liabilities expected to be recognized during the third year following the current year. No authoritative reference available. false 27 Amortization of intangible liabilities, 2014 4 bni_FutureAmortizationOfIntangibleLiabilitiesFourthYearFollowingCurrentYear bni false debit instant The amount of amortization of intangible liabilities expected to be recognized during the fourth year following the current... false false false false false false false false false false false verboselabel false 1 false true false false 179000000 179 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:monetaryItemType monetary The amount of amortization of intangible liabilities expected to be recognized during the fourth year following the current year. No authoritative reference available. false 28 Goodwill and Other Intangible Assets and Liabilities (Textuals) [Abstract] 3 bni_GoodwillAndOtherIntangibleAssetsAndLiabilitiesTextualsAbstract bni false na duration Goodwill and Other Intangible Assets and Liabilities Textuals Abstract. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:stringItemType string Goodwill and Other Intangible Assets and Liabilities Textuals Abstract. false 29 Impairment losses related to goodwill 4 us-gaap_GoodwillImpairmentLoss us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 0 0 true false false 2 false true false false 0 0 true false false 3 false true false false 0 0 true false false 4 false false false false 0 0 true false false xbrli:monetaryItemType monetary Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e(2) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 47 -Subparagraph b Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 20 false 30 Accumulated impairment losses related to goodwill 4 bni_AccumulatedImpairmentLossesRelatedToGoodwill bni false credit instant Accumulated impairment losses resulting from the write-down of goodwill after comparing the implied fair value of reporting... false false false false false false false false false false false verboselabel false 1 true true false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 true true false false 0 0 true false false xbrli:monetaryItemType monetary Accumulated impairment losses resulting from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. No authoritative reference available. false 4 26 false Millions UnKnown UnKnown false true