v2.4.1.9
Commitments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitments [Abstract]      
Rent expense $ 46us-gaap_OperatingLeasesRentExpenseNet $ 31us-gaap_OperatingLeasesRentExpenseNet $ 28us-gaap_OperatingLeasesRentExpenseNet
2014 45us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2015 49us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2016 40us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2017 30us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2018 26us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 62us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Annual non-cancelable minimum lease payments, Total $ 252us-gaap_OperatingLeasesFutureMinimumPaymentsDue