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Investment Securities - AFS and HTM Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
AFS securities    
Amortized cost $ 95,042 $ 92,149
Gross Unrealized Gains 45 74
Gross Unrealized Losses 3,849 4,110
Fair Value 91,238 88,113
HTM securities    
Amortized Cost 64,193 66,694
Gross Unrealized Gains 8 2
Gross Unrealized Losses 10,241 9,243
Fair Value 53,960 57,453
Amortized cost 159,235 158,843
Gross Unrealized Gains 53 76
Gross Unrealized Losses 14,090 13,353
Fair Value 145,198 145,566
U.S. Treasury securities    
AFS securities    
Amortized cost 63,439 58,484
Gross Unrealized Gains 24 24
Gross Unrealized Losses 686 1,103
Fair Value 62,777 57,405
HTM securities    
Amortized Cost 19,103 23,222
Gross Unrealized Gains 0 0
Gross Unrealized Losses 1,326 1,285
Fair Value 17,777 21,937
U.S. agency securities    
AFS securities    
Amortized cost 24,436 25,852
Gross Unrealized Gains 4 4
Gross Unrealized Losses 2,733 2,528
Fair Value 21,707 23,328
HTM securities    
Amortized Cost 42,471 40,894
Gross Unrealized Gains 6 0
Gross Unrealized Losses 8,675 7,699
Fair Value 33,802 33,195
Agency CMBS    
AFS securities    
Amortized cost 5,724 5,871
Gross Unrealized Gains 0 0
Gross Unrealized Losses 418 456
Fair Value 5,306 5,415
HTM securities    
Amortized Cost 1,270 1,337
Gross Unrealized Gains 0 0
Gross Unrealized Losses 115 121
Fair Value 1,155 1,216
State and municipal securities    
AFS securities    
Amortized cost 747 1,132
Gross Unrealized Gains 16 46
Gross Unrealized Losses 3 5
Fair Value 760 1,173
FFELP student loan ABS:    
AFS securities    
Amortized cost 696 810
Gross Unrealized Gains 1 0
Gross Unrealized Losses 9 18
Fair Value $ 688 $ 792
HTM securities    
Third party guarantees (as a percent) 95.00% 95.00%
Non-agency CMBS    
HTM securities    
Amortized Cost $ 1,349 $ 1,241
Gross Unrealized Gains 2 2
Gross Unrealized Losses 125 138
Fair Value $ 1,226 $ 1,105