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Securities (Details 5) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Securities held to maturity    
Securities held to maturity, Amortized Cost $ 10,471 $ 10,438
Securities held to maturity, Gross Unrealized Gains, Recognized in Other Comprehensive Income (OCI) 2 3
Securities held to maturity, gross unrealized losses, recognized in other comprehensive income (OCI) 99 104
Total securities held to maturity, carrying amount 10,374 10,337
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 79 82
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 105 103
Total securities held to maturity, Fair Value 10,348 10,316
US Treasury Securities    
Securities held to maturity    
Securities held to maturity, Amortized Cost 493 492
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 493 492
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 4 5
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 0 0
Total securities held to maturity, Fair Value 497 497
Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies    
Securities held to maturity    
Securities held to maturity, Amortized Cost 8,342 8,301
Securities held to maturity, Gross Unrealized Gains, Recognized in Other Comprehensive Income (OCI) 2 3
Securities held to maturity, gross unrealized losses, recognized in other comprehensive income (OCI) 38 41
Total securities held to maturity, carrying amount 8,306 8,263
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 32 34
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 98 96
Total securities held to maturity, Fair Value 8,240 8,201
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities    
Securities held to maturity    
Securities held to maturity, Amortized Cost 1,636 1,645
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) 61 63
Total securities held to maturity, carrying amount 1,575 1,582
Securities held to maturity, Gross Unrealized Gains, Not Recognized in OCI 43 43
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 7 7
Total securities held to maturity, Fair Value $ 1,611 $ 1,618