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Goodwill and Intangible Assets, Net - Summary of Estimated Future Amortization Expense Related to Intangible Assets with Definite Lives (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]    
2015 $ 31us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
2016 31us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 29us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 27us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 24us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
2020 and thereafter 42us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Intangible assets with definite lives, net $ 184us-gaap_FiniteLivedIntangibleAssetsNet $ 22us-gaap_FiniteLivedIntangibleAssetsNet