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Estimated Amortization Expense Other Intangible Assets (Detail) (Other Intangible Assets, USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Other Intangible Assets
 
Finite-Lived Intangible Assets [Line Items]  
Remainder of 2014 $ 1
2015 2
2016 2
2017 2
2018 $ 2