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Commitments and Contingencies Lease Commitments - Future Minimum Lease Payments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Future Minimum Lease Payments for Capital and Operating Leases [Line Items]      
Rent Expense for Operating Leases $ 628bni_RentExpenseForOperatingLeases $ 594bni_RentExpenseForOperatingLeases $ 629bni_RentExpenseForOperatingLeases
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Minimum capital lease payments - 2015 116us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent    
Minimum capital lease payments - 2016 194us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears    
Minimum capital lease payments - 2017 76us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears    
Minimum capital lease payments - 2018 73us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears    
Minimum capital lease payments - 2019 71us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears    
Minimum capital lease payments - Thereafter 430us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter    
Total minimum capital leases payments 960us-gaap_CapitalLeasesFutureMinimumPaymentsDue    
Capital lease payments - amount representing interest (215)us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments    
Present value of minimum capital lease payments 745us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments    
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Minimum operating lease payments - 2015 562us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent [1]    
Minimum operating lease payments - 2016 562us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears [1]    
Minimum operating lease payments - 2017 507us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears [1]    
Minimum operating lease payments - 2018 449us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears [1]    
Minimum operating lease payments - 2019 421us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears [1]    
Minimum operating lease payments - Thereafter 1,882us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter [1]    
Total minimum operating lease payments $ 4,383us-gaap_OperatingLeasesFutureMinimumPaymentsDue [1]    
[1] Excludes leases having non-cancelable lease terms of less than one year and per diem leases.