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Goodwill and Acquired Intangible Assets Aggregate Amortization Expense for Acquired Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense - Actual 2014 $ 47us-gaap_AmortizationOfIntangibleAssets $ 44us-gaap_AmortizationOfIntangibleAssets $ 37us-gaap_AmortizationOfIntangibleAssets
Amortization expense - 2015 43us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Amortization expense - 2016 34us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Amortization expense - 2017 25us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Amortization expense - 2018 14us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Amortization expense - 2019 $ 11us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive