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Investment Securities - AFS and HTM Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
AFS securities    
Amortized Cost $ 93,167 $ 102,515
Gross Unrealized Gains 89 954
Gross Unrealized Losses 2,902 639
Fair  Value 90,354 102,830
HTM securities    
Amortized Cost 80,439 80,168
Gross Unrealized Gains 123 1,079
Gross Unrealized Losses 4,786 1,365
Fair  Value 75,776 79,882
Amortized Cost 173,606 182,683
Gross Unrealized Gains 212 2,033
Gross Unrealized Losses 7,688 2,004
Fair  Value 166,130 182,712
U.S. Treasury securities    
AFS securities    
Amortized Cost 57,973 58,974
Gross Unrealized Gains 25 343
Gross Unrealized Losses 1,519 296
Fair  Value 56,479 59,021
HTM securities    
Amortized Cost 29,526 28,653
Gross Unrealized Gains 117 882
Gross Unrealized Losses 544 81
Fair  Value 29,099 29,454
U.S. agency securities    
AFS securities    
Amortized Cost 23,863 26,780
Gross Unrealized Gains 13 274
Gross Unrealized Losses 1,143 241
Fair  Value 22,733 26,813
HTM securities    
Amortized Cost 47,656 48,195
Gross Unrealized Gains 5 169
Gross Unrealized Losses 4,079 1,228
Fair  Value 43,582 47,136
Agency CMBS    
AFS securities    
Amortized Cost 8,596 14,476
Gross Unrealized Gains 42 289
Gross Unrealized Losses 189 89
Fair  Value 8,449 14,676
HTM securities    
Amortized Cost 2,166 2,267
Gross Unrealized Gains 0 0
Gross Unrealized Losses 115 51
Fair  Value 2,051 2,216
State and municipal securities    
AFS securities    
Amortized Cost 1,334 613
Gross Unrealized Gains 5 37
Gross Unrealized Losses 37 2
Fair  Value 1,302 648
FFELP student loan ABS:    
AFS securities    
Amortized Cost 1,401 1,672
Gross Unrealized Gains 4 11
Gross Unrealized Losses 14 11
Fair  Value $ 1,391 1,672
HTM securities    
Third party guarantees (as a percent) 95.00%  
Non-agency CMBS    
HTM securities    
Amortized Cost $ 1,091 1,053
Gross Unrealized Gains 1 28
Gross Unrealized Losses 48 5
Fair  Value $ 1,044 $ 1,076