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Securities (Details 5) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Securities held to maturity    
Securities held to maturity, Amortized Cost $ 10,371 $ 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) 115 126
Total securities held to maturity, carrying amount 10,259 10,158
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 315 99
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI (1) (50)
Total securities held to maturity, Fair Value 10,573 10,207
US Treasury Securities    
Securities held to maturity    
Securities held to maturity, Amortized Cost 490 489
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 490 489
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 15 (4)
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 0 0
Total securities held to maturity, Fair Value 505 493
US Government Agencies Debt Securities    
Securities held to maturity    
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
Total securities held to maturity, carrying amount   220
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI   0
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI   4
Total securities held to maturity, Fair Value   216
Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies    
Securities held to maturity    
Securities held to maturity, Amortized Cost 8,170 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) 47 53
Total securities held to maturity, carrying amount 8,126 7,782
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI (204) (49)
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 1 41
Total securities held to maturity, Fair Value 8,329 7,790
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities    
Securities held to maturity    
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) 68 73
Total securities held to maturity, carrying amount 1,643 1,667
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI (96) (46)
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 0 5
Total securities held to maturity, Fair Value 1,739 1,708
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment $ 1,711 $ 1,740