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Securities (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Transfer of HTM securities to AFS $ 517  
FNMA Investment [Member]    
Securities, amortized cost 12,200  
Securities, fair value 12,000  
FHLMC Investment [Member]    
Securities, amortized cost 5,800  
Securities, fair value 5,700  
States and Political Subdivisions [Member]    
Portion of unrealized loss on state and political subdivisions securities that is the result of fair value hedge basis adjustments 39  
Acquired from FDIC Securities [Member]    
Contractually specified indemnification amount, AFS securities 492  
Acquired from FDIC Securities [Member] | Non-Agency MBS [Member]    
Securities, fair value 768 $ 931
Acquired from FDIC Securities [Member] | States and Political Subdivisions [Member]    
Securities, fair value $ 296 $ 312