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Securities (Details 5) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Securities held to maturity    
Securities held to maturity, Amortized Cost $ 10,468 $ 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) 131 148
Total securities held to maturity, carrying amount 10,341 8,291
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 196 132
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 9 11
Total securities held to maturity, Fair Value 10,528 8,412
U.S. Treasury    
Securities held to maturity    
Securities held to maturity, Amortized Cost 488 486
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 488 486
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 11 3
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 0 0
Total securities held to maturity, Fair Value 499 489
U.S. government sponsored agencies    
Securities held to maturity    
Securities held to maturity, Amortized Cost 900 125
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 900 125
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 1 0
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 0 0
Total securities held to maturity, Fair Value 901 125
Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies    
Securities held to maturity    
Securities held to maturity, Amortized Cost 7,322 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) 56 66
Total securities held to maturity, carrying amount 7,270 5,942
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 113 76
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 8 5
Total securities held to maturity, Fair Value 7,375 6,013
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities    
Securities held to maturity    
Securities held to maturity, Amortized Cost 1,758 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) 75 82
Total securities held to maturity, carrying amount 1,683 1,738
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 71 53
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 1 6
Total securities held to maturity, Fair Value $ 1,753 $ 1,785