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Securities - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
States and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Portion of unrealized loss on state and political subdivisions securities that is the result of fair value hedge basis adjustments $ 48  
FNMA investments    
Schedule of Available-for-sale Securities [Line Items]    
Securities, amortized cost 15,400  
Securities, fair value 15,400  
FHLMC investments    
Schedule of Available-for-sale Securities [Line Items]    
Securities, amortized cost 6,800  
Securities, fair value 6,800  
Acquired from FDIC    
Schedule of Available-for-sale Securities [Line Items]    
Contractually specified indemnification amount, AFS securities 472  
Acquired from FDIC | Non-agency MBS    
Schedule of Available-for-sale Securities [Line Items]    
Securities, fair value 731 $ 768
Acquired from FDIC | States and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Securities, fair value $ 279 $ 296