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Goodwill and Other Intangible Assets Estimated Aggregate Pre-Tax Amortization Expense Related to Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortization expense remainder of 2015 $ 12us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
Amortization expense 2016 15us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Amortization expense 2017 13us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Amortization expense 2018 10us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Amortization expense 2019 $ 8us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive