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Securities - Securities Held to Maturity with a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Securities held to maturity    
Less than 12 months, Fair Value $ 16 $ 697
Less than 12 months, Unrealized Losses, Recognized in OCI 0 0
Less than 12 months, Unrealized Losses, Not Recognized in OCI 0 11
12 months or more, Fair Value 9,250 9,083
12 months or more, Unrealized Losses, Recognized in OCI 130 138
12 months or more, Unrealized Losses, Not Recognized in OCI 141 200
Total, Fair Value 9,266 9,780
Total, Unrealized Losses, Recognized in OCI 130 138
Total, Unrealized Losses, Not Recognized in OCI 141 211
Securities held to maturity 10,331 10,720
Held-to-maturity Securities 10,409 10,901
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 63 30
Held to Maturity Securities Amortized Cost 10,538 11,038
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income 1 1
U.S. Treasury securities    
Securities held to maturity    
Less than 12 months, Fair Value 0  
Less than 12 months, Unrealized Losses, Recognized in OCI 0  
Less than 12 months, Unrealized Losses, Not Recognized in OCI 0  
12 months or more, Fair Value 398  
12 months or more, Unrealized Losses, Recognized in OCI 0  
12 months or more, Unrealized Losses, Not Recognized in OCI 1  
Total, Fair Value 398 496
Total, Unrealized Losses, Recognized in OCI 0 0
Total, Unrealized Losses, Not Recognized in OCI 1 2
Securities held to maturity 427 527
Held-to-maturity Securities 427 528
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 1 1
Held to Maturity Securities Amortized Cost 427 528
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income 0 0
US Government Agencies Debt Securities [Member]    
Securities held to maturity    
Less than 12 months, Fair Value   0
Less than 12 months, Unrealized Losses, Recognized in OCI   0
Less than 12 months, Unrealized Losses, Not Recognized in OCI   0
12 months or more, Fair Value   496
12 months or more, Unrealized Losses, Recognized in OCI   0
12 months or more, Unrealized Losses, Not Recognized in OCI   2
Total, Unrealized Losses, Recognized in OCI 0 0
Total, Unrealized Losses, Not Recognized in OCI 0 0
Securities held to maturity 850 723
Held-to-maturity Securities 850 722
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 0 1
Held to Maturity Securities Amortized Cost 850 722
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income 0 0
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities    
Securities held to maturity    
Less than 12 months, Fair Value 0 668
Less than 12 months, Unrealized Losses, Recognized in OCI 0 0
Less than 12 months, Unrealized Losses, Not Recognized in OCI 0 11
12 months or more, Fair Value 7,479 7,191
12 months or more, Unrealized Losses, Recognized in OCI 92 96
12 months or more, Unrealized Losses, Not Recognized in OCI 122 180
Total, Fair Value 7,479 7,859
Total, Unrealized Losses, Recognized in OCI 92 96
Total, Unrealized Losses, Not Recognized in OCI 122 191
Securities held to maturity 7,666 8,027
Held-to-maturity Securities 7,749 8,207
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 39 11
Held to Maturity Securities Amortized Cost 7,840 8,302
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income 1 1
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities    
Securities held to maturity    
Less than 12 months, Fair Value 16 29
Less than 12 months, Unrealized Losses, Recognized in OCI 0 0
Less than 12 months, Unrealized Losses, Not Recognized in OCI 0 0
12 months or more, Fair Value 1,373 1,396
12 months or more, Unrealized Losses, Recognized in OCI 38 42
12 months or more, Unrealized Losses, Not Recognized in OCI 18 18
Total, Fair Value 1,389 1,425
Total, Unrealized Losses, Recognized in OCI 38 42
Total, Unrealized Losses, Not Recognized in OCI 18 18
Securities held to maturity 1,388 1,443
Held-to-maturity Securities 1,383 1,444
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 23 17
Held to Maturity Securities Amortized Cost 1,421 1,486
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income $ 0 $ 0