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Investment Securities - AFS and HTM Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
AFS securities    
AFS securities: Amortized cost, total $ 102,515 $ 108,055
Gross Unrealized Gains 954 2,389
Gross Unrealized Losses 639 61
Fair Value 102,830 110,383
HTM securities    
Amortized Cost 80,168 71,771
Gross Unrealized Gains 1,079 2,659
Gross Unrealized Losses 1,365 10
Fair Value 79,882 74,420
Amortized Cost 182,683 179,826
Gross Unrealized Gains 2,033 5,048
Gross Unrealized Losses 2,004 71
Fair Value 182,712 184,803
U.S. Treasury securities    
AFS securities    
AFS securities: Amortized cost, total 58,974 45,345
Gross Unrealized Gains 343 1,010
Gross Unrealized Losses 296 0
Fair Value 59,021 46,355
HTM securities    
Amortized Cost 28,653 29,346
Gross Unrealized Gains 882 1,893
Gross Unrealized Losses 81 0
Fair Value 29,454 31,239
U.S. agency securities    
AFS securities    
AFS securities: Amortized cost, total 26,780 37,389
Gross Unrealized Gains 274 762
Gross Unrealized Losses 241 25
Fair Value 26,813 38,126
HTM securities    
Amortized Cost 48,195 38,951
Gross Unrealized Gains 169 704
Gross Unrealized Losses 1,228 8
Fair Value 47,136 39,647
Agency CMBS    
AFS securities    
AFS securities: Amortized cost, total 14,476 19,982
Gross Unrealized Gains 289 465
Gross Unrealized Losses 89 9
Fair Value 14,676 20,438
HTM securities    
Amortized Cost 2,267 2,632
Gross Unrealized Gains 0 4
Gross Unrealized Losses 51 2
Fair Value 2,216 2,634
Non-agency CMBS    
HTM securities    
Amortized Cost 1,053 842
Gross Unrealized Gains 28 58
Gross Unrealized Losses 5 0
Fair Value 1,076 900
Corporate bonds    
AFS securities    
AFS securities: Amortized cost, total   1,694
Gross Unrealized Gains   42
Gross Unrealized Losses   0
Fair Value   1,736
State and municipal securities    
AFS securities    
AFS securities: Amortized cost, total 613 1,461
Gross Unrealized Gains 37 103
Gross Unrealized Losses 2 1
Fair Value 648 1,563
FFELP student loan ABS    
AFS securities    
AFS securities: Amortized cost, total 1,672 1,735
Gross Unrealized Gains 11 7
Gross Unrealized Losses 11 26
Fair Value $ 1,672 $ 1,716
HTM securities    
Third party guarantees (as a percent) 95.00% 95.00%
Other ABS    
AFS securities    
AFS securities: Amortized cost, total   $ 449
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Fair Value   $ 449