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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
AFS securities:    
Amortized Cost $ 82,998 $ 84,056
Gross Unrealized Gains 20 15
Gross Unrealized Losses 11,160 12,270
AFS securities, Fair Value 71,858 71,801
HTM securities:    
Amortized Cost 56,932 57,713
HTM securities, Fair Value 48,097 47,791
U.S. Treasury    
AFS securities:    
Amortized Cost 11,083 11,080
Gross Unrealized Gains 2 0
Gross Unrealized Losses 644 785
AFS securities, Fair Value 10,441 10,295
GSE    
AFS securities:    
Amortized Cost 332 339
Gross Unrealized Gains 0 0
Gross Unrealized Losses 31 36
AFS securities, Fair Value 301 303
Agency MBS - residential    
AFS securities:    
Amortized Cost 64,382 65,377
Gross Unrealized Gains 1 0
Gross Unrealized Losses 9,208 10,152
AFS securities, Fair Value 55,175 55,225
HTM securities:    
Amortized Cost 56,932 57,713
Gross Unrealized Gains 0 0
Gross Unrealized Losses 8,835 9,922
HTM securities, Fair Value 48,097 47,791
Agency MBS - commercial    
AFS securities:    
Amortized Cost 2,872 2,887
Gross Unrealized Gains 0 0
Gross Unrealized Losses 474 463
AFS securities, Fair Value 2,398 2,424
States and political subdivisions    
AFS securities:    
Amortized Cost 425 425
Gross Unrealized Gains 17 15
Gross Unrealized Losses 17 24
AFS securities, Fair Value 425 416
Non-agency MBS    
AFS securities:    
Amortized Cost 3,884 3,927
Gross Unrealized Gains 0 0
Gross Unrealized Losses 786 810
AFS securities, Fair Value 3,098 3,117
Other    
AFS securities:    
Amortized Cost 20 21
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
AFS securities, Fair Value $ 20 $ 21