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Estimated Amortization Expense Mortgage Servicing Rights (Detail) (Mortgage Servicing Rights, USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Mortgage Servicing Rights
 
Finite-Lived Intangible Assets [Line Items]  
Remainder of 2015 $ 131us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
2016 155us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
2017 135us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
2018 118us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
2019 $ 104us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember