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Estimated Aggregate Pre-Tax Amortization Expense Related to Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortization expense remainder of 2014 $ 11
Amortization expense 2015 20
Amortization expense 2016 18
Amortization expense 2017 15
Amortization expense 2018 $ 12