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Investment Securities - AFS and HTM Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
AFS securities    
Amortized Cost $ 90,188 $ 102,515
Gross Unrealized Gains 25 954
Gross Unrealized Losses 4,243 639
Fair  Value 85,970 102,830
HTM securities    
Amortized Cost 79,477 80,168
Gross Unrealized Gains 3 1,079
Gross Unrealized Losses 7,738 1,365
Fair  Value 71,742 79,882
Amortized cost 169,665 182,683
Gross Unrealized Gains 28 2,033
Gross Unrealized Losses 11,981 2,004
Fair  Value 157,712 182,712
U.S. Treasury securities    
AFS securities    
Amortized Cost 56,570 58,974
Gross Unrealized Gains 3 343
Gross Unrealized Losses 1,915 296
Fair  Value 54,658 59,021
HTM securities    
Amortized Cost 30,133 28,653
Gross Unrealized Gains 3 882
Gross Unrealized Losses 1,043 81
Fair  Value 29,093 29,454
U.S. agency securities    
AFS securities    
Amortized Cost 23,566 26,780
Gross Unrealized Gains 4 274
Gross Unrealized Losses 1,917 241
Fair  Value 21,653 26,813
HTM securities    
Amortized Cost 46,138 48,195
Gross Unrealized Gains 0 169
Gross Unrealized Losses 6,458 1,228
Fair  Value 39,680 47,136
Agency CMBS    
AFS securities    
Amortized Cost 6,449 14,476
Gross Unrealized Gains 5 289
Gross Unrealized Losses 285 89
Fair  Value 6,169 14,676
HTM securities    
Amortized Cost 2,079 2,267
Gross Unrealized Gains 0 0
Gross Unrealized Losses 140 51
Fair  Value 1,939 2,216
State and municipal securities    
AFS securities    
Amortized Cost 2,322 613
Gross Unrealized Gains 13 37
Gross Unrealized Losses 91 2
Fair  Value 2,244 648
FFELP student loan ABS:    
AFS securities    
Amortized Cost 1,281 1,672
Gross Unrealized Gains 0 11
Gross Unrealized Losses 35 11
Fair  Value $ 1,246 1,672
HTM securities    
Third party guarantees (as a percent) 95.00%  
Non-agency CMBS    
HTM securities    
Amortized Cost $ 1,127 1,053
Gross Unrealized Gains 0 28
Gross Unrealized Losses 97 5
Fair  Value $ 1,030 $ 1,076