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Leases Rentals and Outsourced Service Arrangements (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases Rentals And Outsourced Service Arrangements [Line Items]      
Rental expense for operating leases $ 150us-gaap_OperatingLeasesRentExpenseNet $ 137us-gaap_OperatingLeasesRentExpenseNet $ 144us-gaap_OperatingLeasesRentExpenseNet
Future net minimum rental payments under non-cancelable operating leases 605us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Future minimum rental payments under non-cancelable operating leases payable in 2015 140us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
Future minimum rental payments under non-cancelable operating leases payable in 2016 120us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
Future minimum rental payments under non-cancelable operating leases payable in 2017 87us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
Future minimum rental payments under non-cancelable operating leases payable in 2018 71us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
Future minimum rental payments under non-cancelable operating leases payable in 2019 59us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Future minimum rental payments under non-cancelable operating leases payable thereafter $ 128us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Minimum [Member] | Office space [Member]      
Leases Rentals And Outsourced Service Arrangements [Line Items]      
Term length for operating leases 1 month    
Maximum [Member] | Office space [Member]      
Leases Rentals And Outsourced Service Arrangements [Line Items]      
Term length for operating leases 18 years