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Other Intangible Assets - Estimated Amortization Expense of Existing Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]    
2015 $ 64us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 54us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 36us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 19us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 10us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 10us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Net Cost $ 193us-gaap_FiniteLivedIntangibleAssetsNet $ 217us-gaap_FiniteLivedIntangibleAssetsNet