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Debt Debt Obligation Maturities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Maturities [Abstract]    
Debt maturities - 2015 $ 366us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
Debt maturities - 2016 376us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
Debt maturities - 2017 715us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
Debt maturities - 2018 720us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
Debt maturities - 2019 816us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Debt maturities - Thereafter 16,287us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive  
Total Debt 19,280us-gaap_DebtAndCapitalLeaseObligations [1] 17,006us-gaap_DebtAndCapitalLeaseObligations [1]
Total Debt excluding capital leases 18,471us-gaap_LongTermDebt [2],[3]  
Total Debt excluding capital leases, Fair Value $ 20,543us-gaap_LongTermDebtFairValue [3] $ 16,507us-gaap_LongTermDebtFairValue [3]
Weighted Average Interest Rate on Debt and Capital Lease Obligations [Abstract]    
Weighted Average Interest Rate On Debt And Capital Lease Obligations - 2015 5.20%bni_WeightedAverageInterestRateOnDebtAndCapitalLeaseObligationsInNextTwelveMonths  
Weighted Average Interest Rate On Debt And Capital Lease Obligations - 2016 6.60%bni_WeightedAverageInterestRateOnDebtAndCapitalLeaseObligationsInYearTwo  
Weighted Average Interest Rate On Debt And Capital Lease Obligations - 2017 5.70%bni_WeightedAverageInterestRateOnDebtAndCapitalLeaseObligationsInYearThree  
Weighted Average Interest Rate On Debt And Capital Lease Obligations - 2018 5.80%bni_WeightedAverageInterestRateOnDebtAndCapitalLeaseObligationsInYearFour  
Weighted Average Interest Rate On Debt And Capital Lease Obligations - 2019 4.80%bni_WeightedAverageInterestRateOnDebtAndCapitalLeaseObligationsInYearFive  
Weighted Average Interest Rate On Debt And Capital Lease Obligations - Thereafter 5.00%bni_WeightedAverageInterestRateOnDebtAndCapitalLeaseObligationsAfterYearFive  
Total Debt, Weighted Average Interest Rate 5.00%us-gaap_DebtWeightedAverageInterestRate  
[1] Amounts represent debt outstanding and weighted average effective interest rates for 2014 and 2013, respectively. Maturities are as of December 31, 2014.
[2] Amount also excludes unamortized fair value adjustment under acquisition method accounting related to capital leases.
[3] Amount also excludes unamortized gains on interest rate swaps.