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Securities - Securities Held to Maturity with a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Securities held to maturity    
Less than 12 months, Fair Value $ 3,068 $ 1,332
Less than 12 months, Unrealized Losses, Recognized in OCI 0 0
Less than 12 months, Unrealized Losses, Not Recognized in OCI 88 27
12 months or more, Fair Value 1,976 2,472
12 months or more, Unrealized Losses, Recognized in OCI 48 66
12 months or more, Unrealized Losses, Not Recognized in OCI 0 0
Total, Fair Value 5,044 3,804
Total, Unrealized Losses, Recognized in OCI 48 66
Total, Unrealized Losses, Not Recognized in OCI 88 27
Securities held to maturity 7,838 7,532
Debt Securities, Held-to-maturity 7,759 7,311
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 167 248
Held to Maturity Securities Amortized Cost 7,807 7,376
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income 0 1
U.S. Treasury and government agencies    
Securities held to maturity    
Less than 12 months, Fair Value 3,059 1,267
Less than 12 months, Unrealized Losses, Recognized in OCI 0 0
Less than 12 months, Unrealized Losses, Not Recognized in OCI 88 27
12 months or more, Fair Value 0 0
12 months or more, Unrealized Losses, Recognized in OCI 0 0
12 months or more, Unrealized Losses, Not Recognized in OCI 0 0
Total, Fair Value 3,059 1,267
Total, Unrealized Losses, Recognized in OCI 0 0
Total, Unrealized Losses, Not Recognized in OCI 88 27
Securities held to maturity 3,945 2,255
Debt Securities, Held-to-maturity 4,016 2,260
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 17 22
Held to Maturity Securities Amortized Cost 4,016 2,260
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 9 65
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 1,976 2,472
12 months or more, Unrealized Losses, Recognized in OCI 48 66
12 months or more, Unrealized Losses, Not Recognized in OCI 0 0
Total, Fair Value 1,985 2,537
Total, Unrealized Losses, Recognized in OCI 48 66
Total, Unrealized Losses, Not Recognized in OCI 0 0
Securities held to maturity 3,893 5,277
Debt Securities, Held-to-maturity 3,743 5,051
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 150 226
Held to Maturity Securities Amortized Cost 3,791 5,116
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income $ 0 $ 1