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Commitments and Contingencies (Schedule of Future Minimum Rental Payments) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases, Operating [Abstract]      
2015 $ 230us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 183us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 150us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 109us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 82us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 114us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total noncancelable operating lease commitments 868us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Operating Leases, Rent Expense, Net [Abstract]      
Rent expense $ 228us-gaap_LeaseAndRentalExpense $ 217us-gaap_LeaseAndRentalExpense $ 229us-gaap_LeaseAndRentalExpense