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Securities (Details 6) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Securities held to maturity    
Less than 12 months, Fair Value $ 151 $ 3,690
Less than 12 months, Unrealized Losses, Recognized in OCI 0 0
Less than 12 months, Unrealized Losses, Not Recognized in OCI 1 44
12 months or more, Fair Value 3,038 3,133
12 months or more, Unrealized Losses, Recognized in OCI 115 126
12 months or more, Unrealized Losses, Not Recognized in OCI 0 6
Total, Fair Value 3,189 6,823
Total, Unrealized Losses, Recognized in OCI 115 126
Total, Unrealized Losses, Not Recognized in OCI (1) (50)
US Treasury Securities    
Securities held to maturity    
Total, Unrealized Losses, Recognized in OCI 0 0
Total, Unrealized Losses, Not Recognized in OCI 0 0
U.S. government sponsored agencies    
Securities held to maturity    
Less than 12 months, Fair Value   196
Less than 12 months, Unrealized Losses, Recognized in OCI   0
Less than 12 months, Unrealized Losses, Not Recognized in OCI   4
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
Total, Fair Value   196
Total, Unrealized Losses, Recognized in OCI   0
Total, Unrealized Losses, Not Recognized in OCI   4
Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies    
Securities held to maturity    
Less than 12 months, Fair Value 98 3,297
Less than 12 months, Unrealized Losses, Recognized in OCI 0 0
Less than 12 months, Unrealized Losses, Not Recognized in OCI 1 39
12 months or more, Fair Value 1,572 1,705
12 months or more, Unrealized Losses, Recognized in OCI 47 53
12 months or more, Unrealized Losses, Not Recognized in OCI 0 2
Total, Fair Value 1,670 5,002
Total, Unrealized Losses, Recognized in OCI 47 53
Total, Unrealized Losses, Not Recognized in OCI 1 41
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities    
Securities held to maturity    
Total, Fair Value 1,519 1,625
Total, Unrealized Losses, Recognized in OCI 68 73
Total, Unrealized Losses, Not Recognized in OCI 0 5
Commercial Mortgage Backed Securities [Member]    
Securities held to maturity    
Less than 12 months, Fair Value 53 197
Less than 12 months, Unrealized Losses, Recognized in OCI 0 0
Less than 12 months, Unrealized Losses, Not Recognized in OCI 0 1
12 months or more, Fair Value 1,466 1,428
12 months or more, Unrealized Losses, Recognized in OCI 68 73
12 months or more, Unrealized Losses, Not Recognized in OCI $ 0 $ 4