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Securities - Securities Held to Maturity with a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Securities held to maturity    
Less than 12 months, Fair Value $ 1,258 $ 697
Less than 12 months, Unrealized Losses, Recognized in OCI 1 0
Less than 12 months, Unrealized Losses, Not Recognized in OCI 3 11
12 months or more, Fair Value 7,336 9,083
12 months or more, Unrealized Losses, Recognized in OCI 124 138
12 months or more, Unrealized Losses, Not Recognized in OCI 39 200
Total, Fair Value 8,594 9,780
Total, Unrealized Losses, Recognized in OCI 125 138
Total, Unrealized Losses, Not Recognized in OCI 42 211
Securities held to maturity 9,967 10,720
Debt Securities, Held-to-maturity 9,883 10,901
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 126 30
Held to Maturity Securities Amortized Cost 10,007 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 4  
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 249  
12 months or more, Unrealized Losses, Recognized in OCI 0  
12 months or more, Unrealized Losses, Not Recognized in OCI 0  
Total, Fair Value 253 496
Total, Unrealized Losses, Recognized in OCI 0 0
Total, Unrealized Losses, Not Recognized in OCI 0 2
Securities held to maturity 278 527
Debt Securities, Held-to-maturity 278 528
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 1
Held to Maturity Securities Amortized Cost 278 528
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 297 0
Less than 12 months, Unrealized Losses, Recognized in OCI 0 0
Less than 12 months, Unrealized Losses, Not Recognized in OCI 3 0
12 months or more, Fair Value 0 496
12 months or more, Unrealized Losses, Recognized in OCI 0 0
12 months or more, Unrealized Losses, Not Recognized in OCI 0 2
Total, Fair Value 297  
Total, Unrealized Losses, Recognized in OCI 0 0
Total, Unrealized Losses, Not Recognized in OCI 3 0
Securities held to maturity 596 723
Debt Securities, Held-to-maturity 599 722
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 1
Held to Maturity Securities Amortized Cost 599 722
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 957 668
Less than 12 months, Unrealized Losses, Recognized in OCI 1 0
Less than 12 months, Unrealized Losses, Not Recognized in OCI 0 11
12 months or more, Fair Value 5,802 7,191
12 months or more, Unrealized Losses, Recognized in OCI 90 96
12 months or more, Unrealized Losses, Not Recognized in OCI 32 180
Total, Fair Value 6,759 7,859
Total, Unrealized Losses, Recognized in OCI 91 96
Total, Unrealized Losses, Not Recognized in OCI 32 191
Securities held to maturity 7,764 8,027
Debt Securities, Held-to-maturity 7,702 8,207
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 94 11
Held to Maturity Securities Amortized Cost 7,792 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 0 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 1,285 1,396
12 months or more, Unrealized Losses, Recognized in OCI 34 42
12 months or more, Unrealized Losses, Not Recognized in OCI 7 18
Total, Fair Value 1,285 1,425
Total, Unrealized Losses, Recognized in OCI 34 42
Total, Unrealized Losses, Not Recognized in OCI 7 18
Securities held to maturity 1,329 1,443
Debt Securities, Held-to-maturity 1,304 1,444
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 32 17
Held to Maturity Securities Amortized Cost 1,338 1,486
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income $ 0 $ 0