XML 24 R30.htm IDEA: XBRL DOCUMENT v2.4.1.9
Goodwill and Acquired Intangible Assets - Aggregate Amortization Expense for Acquired Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense $ 11us-gaap_AmortizationOfIntangibleAssets $ 11us-gaap_AmortizationOfIntangibleAssets $ 47us-gaap_AmortizationOfIntangibleAssets
Amortization expense - Remainder of 2015 42us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear    
Amortization expense - 2016 33us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Amortization expense - 2017 25us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Amortization expense - 2018 14us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Amortization expense - 2019 $ 11us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive