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Securities - Held to Maturity Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Securities held to maturity    
Less than 12 months, Fair Value $ 4,603 $ 3,690
Less than 12 months, Unrealized Losses, Recognized in OCI 0 0
Less than 12 months, Unrealized Losses, Not Recognized in OCI 93 44
12 months or more, Fair Value 2,834 3,133
12 months or more, Unrealized Losses, Recognized in OCI 104 126
12 months or more, Unrealized Losses, Not Recognized in OCI 10 6
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 7,437 6,823
Total, Unrealized Losses, Recognized in OCI 104 126
Total, Unrealized Losses, Not Recognized in OCI 103 50
U.S. Treasury    
Securities held to maturity    
Less than 12 months, Fair Value 0  
Less than 12 months, Unrealized Losses, Recognized in OCI 0  
Less than 12 months, Unrealized Losses, Not Recognized in OCI 0  
12 months or more, Fair Value 0  
12 months or more, Unrealized Losses, Recognized in OCI 0  
12 months or more, Unrealized Losses, Not Recognized in OCI 0  
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 0  
Total, Unrealized Losses, Recognized in OCI 0 0
Total, Unrealized Losses, Not Recognized in OCI 0 0
US Government Agencies Debt Securities    
Securities held to maturity    
Less than 12 months, Fair Value 0 196
Less than 12 months, Unrealized Losses, Recognized in OCI 0 0
Less than 12 months, Unrealized Losses, Not Recognized in OCI 0 4
12 months or more, Fair Value 0 0
12 months or more, Unrealized Losses, Recognized in OCI 0 0
12 months or more, Unrealized Losses, Not Recognized in OCI 0 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 0 196
Total, Unrealized Losses, Recognized in OCI 0 0
Total, Unrealized Losses, Not Recognized in OCI 0 4
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities    
Securities held to maturity    
Less than 12 months, Fair Value 4,492 3,297
Less than 12 months, Unrealized Losses, Recognized in OCI 0 0
Less than 12 months, Unrealized Losses, Not Recognized in OCI 92 39
12 months or more, Fair Value 1,386 1,705
12 months or more, Unrealized Losses, Recognized in OCI 41 53
12 months or more, Unrealized Losses, Not Recognized in OCI 4 2
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 5,878 5,002
Total, Unrealized Losses, Recognized in OCI 41 53
Total, Unrealized Losses, Not Recognized in OCI 96 41
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities    
Securities held to maturity    
Less than 12 months, Fair Value 111 197
Less than 12 months, Unrealized Losses, Recognized in OCI 0 0
Less than 12 months, Unrealized Losses, Not Recognized in OCI 1 1
12 months or more, Fair Value 1,448 1,428
12 months or more, Unrealized Losses, Recognized in OCI 63 73
12 months or more, Unrealized Losses, Not Recognized in OCI 6 4
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 1,559 1,625
Total, Unrealized Losses, Recognized in OCI 63 73
Total, Unrealized Losses, Not Recognized in OCI $ 7 $ 5