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Investment Securities - AFS Securities in an Unrealized Loss Position (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
AFS securities    
AFS: Fair value, less than 12 months $ 14,774 $ 19,172
AFS: Fair value, 12 months or longer 53,702 57,983
AFS: Fair value, total 68,476 77,155
AFS: Gross unrealized losses, less than 12 months 32 69
AFS: Gross unrealized losses, 12 months or longer 3,817 4,041
AFS: Gross unrealized losses, total 3,849 4,110
Amortized cost 95,042 92,149
Fair Value 91,238 88,113
U.S. Treasury securities    
AFS securities    
AFS: Fair value, less than 12 months 13,972 14,295
AFS: Fair value, 12 months or longer 27,444 33,458
AFS: Fair value, total 41,416 47,753
AFS: Gross unrealized losses, less than 12 months 29 22
AFS: Gross unrealized losses, 12 months or longer 657 1,081
AFS: Gross unrealized losses, total 686 1,103
AFS securities: Amortized cost, due within 1 year 16,131  
AFS securities: Fair value, due within 1 year $ 15,928  
AFS securities: Annualized average yield, due within 1 year (as a percent) 1.70%  
AFS securities: Amortized cost, after 1 year through 5 years $ 39,883  
AFS securities: Fair value, after 1 year through 5 years $ 39,427  
AFS securities: Annualized average yield, after 1 year through 5 years (as a percent) 3.20%  
AFS securities: Amortized cost, after 5 years through 10 years $ 7,425  
AFS securities: Fair value, after 5 years through 10 years $ 7,422  
AFS securities: Annualized average yield, after 5 years through 10 years (as a percent) 4.20%  
Amortized cost $ 63,439 58,484
Fair Value 62,777 57,405
U.S. agency securities    
AFS securities    
AFS: Fair value, less than 12 months 357 4,297
AFS: Fair value, 12 months or longer 20,415 18,459
AFS: Fair value, total 20,772 22,756
AFS: Gross unrealized losses, less than 12 months 1 43
AFS: Gross unrealized losses, 12 months or longer 2,732 2,485
AFS: Gross unrealized losses, total 2,733 2,528
AFS securities: Amortized cost, due within 1 year 10  
AFS securities: Fair value, due within 1 year $ 10  
AFS securities: Annualized average yield, due within 1 year (as a percent) (0.40%)  
AFS securities: Amortized cost, after 1 year through 5 years $ 313  
AFS securities: Fair value, after 1 year through 5 years $ 296  
AFS securities: Annualized average yield, after 1 year through 5 years (as a percent) 1.60%  
AFS securities: Amortized cost, after 5 years through 10 years $ 481  
AFS securities: Fair value, after 5 years through 10 years $ 439  
AFS securities: Annualized average yield, after 5 years through 10 years (as a percent) 1.80%  
AFS securities: Amortized cost, after 10 years $ 23,632  
AFS securities: Fair value, after 10 years $ 20,962  
AFS securities: Annualized average yield, after 10 years (as a percent) 3.70%  
Amortized cost $ 24,436 25,852
Fair Value 21,707 23,328
Agency CMBS    
AFS securities    
AFS: Fair value, 12 months or longer 5,282 5,415
AFS: Fair value, total 5,282 5,415
AFS: Gross unrealized losses, 12 months or longer 418 456
AFS: Gross unrealized losses, total 418 456
AFS securities: Amortized cost, due within 1 year 1  
AFS securities: Fair value, due within 1 year $ 1  
AFS securities: Annualized average yield, due within 1 year (as a percent) (2.20%)  
AFS securities: Amortized cost, after 1 year through 5 years $ 3,534  
AFS securities: Fair value, after 1 year through 5 years $ 3,405  
AFS securities: Annualized average yield, after 1 year through 5 years (as a percent) 2.00%  
AFS securities: Amortized cost, after 5 years through 10 years $ 1,053  
AFS securities: Fair value, after 5 years through 10 years $ 991  
AFS securities: Annualized average yield, after 5 years through 10 years (as a percent) 2.00%  
AFS securities: Amortized cost, after 10 years $ 1,136  
AFS securities: Fair value, after 10 years $ 909  
AFS securities: Annualized average yield, after 10 years (as a percent) 1.40%  
Amortized cost $ 5,724 5,871
Fair Value 5,306 5,415
State and municipal securities    
AFS securities    
AFS: Fair value, less than 12 months 419 524
AFS: Fair value, 12 months or longer 35 35
AFS: Fair value, total 454 559
AFS: Gross unrealized losses, less than 12 months 2 3
AFS: Gross unrealized losses, 12 months or longer 1 2
AFS: Gross unrealized losses, total 3 5
AFS securities: Amortized cost, due within 1 year 29  
AFS securities: Fair value, due within 1 year $ 29  
AFS securities: Annualized average yield, due within 1 year (as a percent) 5.10%  
AFS securities: Amortized cost, after 1 year through 5 years $ 307  
AFS securities: Fair value, after 1 year through 5 years $ 306  
AFS securities: Annualized average yield, after 1 year through 5 years (as a percent) 4.80%  
AFS securities: Amortized cost, after 5 years through 10 years $ 90  
AFS securities: Fair value, after 5 years through 10 years $ 90  
AFS securities: Annualized average yield, after 5 years through 10 years (as a percent) 5.30%  
AFS securities: Amortized cost, after 10 years $ 321  
AFS securities: Fair value, after 10 years $ 335  
AFS securities: Annualized average yield, after 10 years (as a percent) 4.30%  
Amortized cost $ 747 1,132
Fair Value 760 1,173
FFELP student loan ABS:    
AFS securities    
AFS: Fair value, less than 12 months 26 56
AFS: Fair value, 12 months or longer 526 616
AFS: Fair value, total 552 672
AFS: Gross unrealized losses, less than 12 months 0 1
AFS: Gross unrealized losses, 12 months or longer 9 17
AFS: Gross unrealized losses, total 9 18
AFS securities: Amortized cost, due within 1 year 13  
AFS securities: Fair value, due within 1 year $ 13  
AFS securities: Annualized average yield, due within 1 year (as a percent) 6.00%  
AFS securities: Amortized cost, after 1 year through 5 years $ 126  
AFS securities: Fair value, after 1 year through 5 years $ 122  
AFS securities: Annualized average yield, after 1 year through 5 years (as a percent) 6.30%  
AFS securities: Amortized cost, after 5 years through 10 years $ 28  
AFS securities: Fair value, after 5 years through 10 years $ 28  
AFS securities: Annualized average yield, after 5 years through 10 years (as a percent) 6.30%  
AFS securities: Amortized cost, after 10 years $ 529  
AFS securities: Fair value, after 10 years $ 525  
AFS securities: Annualized average yield, after 10 years (as a percent) 6.40%  
Amortized cost $ 696 810
Fair Value $ 688 $ 792