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Estimated Amortization Expense Mortgage Servicing Rights (Detail) (Mortgage Servicing Rights, USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Mortgage Servicing Rights
 
Finite-Lived Intangible Assets [Line Items]  
Remainder of 2014 $ 32
2015 119
2016 108
2017 99
2018 $ 90