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Securities - Unrealized Gains/Loss in OCI (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Securities held to maturity    
Securities held to maturity, Amortized Cost $ 10,280 $ 8,433
Securities held to maturity, Gross Unrealized Gains, Recognized in Other Comprehensive Income (OCI) 4 6
Securities held to maturity, gross unrealized losses, recognized in other comprehensive income (OCI) 126 148
Total securities held to maturity, carrying amount 10,158 8,291
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 99 132
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 50 11
Total securities held to maturity, Fair Value 10,207 8,412
U.S. Treasury    
Securities held to maturity    
Securities held to maturity, Amortized Cost 489 486
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 489 486
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 4 3
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 0 0
Total securities held to maturity, Fair Value 493 489
U.S. government sponsored agencies    
Securities held to maturity    
Securities held to maturity, Amortized Cost 220 125
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 220 125
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 0 0
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 4 0
Total securities held to maturity, Fair Value 216 125
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities    
Securities held to maturity    
Securities held to maturity, Amortized Cost 7,831 6,002
Securities held to maturity, Gross Unrealized Gains, Recognized in Other Comprehensive Income (OCI) 4 6
Securities held to maturity, gross unrealized losses, recognized in other comprehensive income (OCI) 53 66
Total securities held to maturity, carrying amount 7,782 5,942
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 49 76
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 41 5
Total securities held to maturity, Fair Value 7,790 6,013
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities    
Securities held to maturity    
Securities held to maturity, Amortized Cost 1,740 1,820
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) 73 82
Total securities held to maturity, carrying amount 1,667 1,738
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 46 53
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 5 6
Total securities held to maturity, Fair Value $ 1,708 $ 1,785