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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Future Minimum Rental Payments      
2015 $ 314us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 229us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 159us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 131us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 75us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 275us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total minimum rental payments under operating leases 1,183us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Minimum rentals to be received under subleases 14us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals    
Rental Expense      
Minimum rental expense 618us-gaap_OperatingLeasesRentExpenseMinimumRentals 588us-gaap_OperatingLeasesRentExpenseMinimumRentals 512us-gaap_OperatingLeasesRentExpenseMinimumRentals
Contingent rental expense 43us-gaap_OperatingLeasesRentExpenseContingentRentals 47us-gaap_OperatingLeasesRentExpenseContingentRentals 67us-gaap_OperatingLeasesRentExpenseContingentRentals
Total rental expense 661us-gaap_LeaseAndRentalExpense 635us-gaap_LeaseAndRentalExpense 579us-gaap_LeaseAndRentalExpense
Less sublease rental income 0us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue 0us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue (2)us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue
Net rental expense 661us-gaap_OperatingLeasesRentExpenseNet 635us-gaap_OperatingLeasesRentExpenseNet 577us-gaap_OperatingLeasesRentExpenseNet
Commitments and Contingencies (Textual)      
Minimum range of possible loss contingency 0us-gaap_LossContingencyRangeOfPossibleLossMinimum    
Maximum range of possible loss contingency $ 200us-gaap_LossContingencyRangeOfPossibleLossMaximum