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Securities - Unrealized Gains/Loss in OCI (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Securities held to maturity    
Amortized Cost $ 10,438 $ 10,280
Securities held to maturity, Gross Unrealized Gains, Recognized in Other Comprehensive Income (OCI) 3 4
Securities held to maturity, gross unrealized losses, recognized in other comprehensive income (OCI) 104 126
Total securities held to maturity, carrying amount 10,337 10,158
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 82 99
Total, Unrealized Losses, Not Recognized in OCI 103 50
Total securities held to maturity, Fair Value 10,316 10,207
U.S. Treasury    
Securities held to maturity    
Amortized Cost 492 489
Securities held to maturity, Gross Unrealized Gains, Recognized in Other Comprehensive Income (OCI) 0 0
Securities held to maturity, gross unrealized losses, recognized in other comprehensive income (OCI) 0 0
Total securities held to maturity, carrying amount 492 489
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 5 4
Total, Unrealized Losses, Not Recognized in OCI 0 0
Total securities held to maturity, Fair Value 497 493
U.S. government-sponsored agencies    
Securities held to maturity    
Amortized Cost   220
Securities held to maturity, Gross Unrealized Gains, Recognized in Other Comprehensive Income (OCI)   0
Securities held to maturity, gross unrealized losses, recognized in other comprehensive income (OCI) 0 0
Total securities held to maturity, carrying amount   220
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI   0
Total, Unrealized Losses, Not Recognized in OCI 0 4
Total securities held to maturity, Fair Value   216
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities    
Securities held to maturity    
Amortized Cost 8,301 7,831
Securities held to maturity, Gross Unrealized Gains, Recognized in Other Comprehensive Income (OCI) 3 4
Securities held to maturity, gross unrealized losses, recognized in other comprehensive income (OCI) 41 53
Total securities held to maturity, carrying amount 8,263 7,782
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 34 49
Total, Unrealized Losses, Not Recognized in OCI 96 41
Total securities held to maturity, Fair Value 8,201 7,790
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities    
Securities held to maturity    
Amortized Cost 1,645 1,740
Securities held to maturity, Gross Unrealized Gains, Recognized in Other Comprehensive Income (OCI) 0 0
Securities held to maturity, gross unrealized losses, recognized in other comprehensive income (OCI) 63 73
Total securities held to maturity, carrying amount 1,582 1,667
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 43 46
Total, Unrealized Losses, Not Recognized in OCI 7 5
Total securities held to maturity, Fair Value $ 1,618 $ 1,708