XML 123 R108.htm IDEA: XBRL DOCUMENT v3.5.0.2
Other Short-Term Borrowings (Securities Sold Under Repurchase Agreements By Collateral Type) (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Short Term Debt    
Securities sold under repurchase agreements $ 751 $ 925
Overnight maturity | U.S. Treasury and federal agencies    
Short Term Debt    
Securities sold under repurchase agreements 114 279
Overnight maturity | Agency mortgage-backed securities | Residential mortgage backed securities    
Short Term Debt    
Securities sold under repurchase agreements $ 637 $ 646