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Securities Sold Under Repurchase Agreements By Collateral Type (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Short Term Debt [Line Items]    
Securities sold under repurchase agreements $ 785 $ 925
Overnight maturity | U.S. Treasury and federal agencies    
Short Term Debt [Line Items]    
Securities sold under repurchase agreements 183 279
Overnight maturity | Agency mortgage-backed securities | Residential mortgage backed securities    
Short Term Debt [Line Items]    
Securities sold under repurchase agreements $ 602 $ 646