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INVESTMENTS - Fair Value of AFS Debt Securities by Contractual Maturity Date (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Fair value    
Total fair value $ 241,783 $ 249,679
Cumulative basis adjustments (171)  
Mortgage-backed securities    
Amoritzed cost    
Amortized cost, due within 1 year 10 42
Amortized cost, after 1 but within 5 years 364 523
Amortized cost, after 5 but within 10 years 570 468
Amortized cost, after 10 years 20,659 11,466
Amortized cost 21,603 12,499
Fair value    
Fair value, due within 1 year 10 44
Fair value, after 1 but within 5 years 354 513
Fair value, after 5 but within 10 years 527 440
Fair value, after 10 years 19,232 10,752
Total fair value 20,123 11,749
U.S. Treasury and federal agency securities    
Amoritzed cost    
Amortized cost, due within 1 year 35,939 25,935
Amortized cost, after 1 but within 5 years 46,561 68,455
Amortized cost, after 5 but within 10 years 529 342
Amortized cost, after 10 years 0 0
Amortized cost 83,029 94,732
Fair value    
Fair value, due within 1 year 35,588 25,829
Fair value, after 1 but within 5 years 45,219 66,166
Fair value, after 5 but within 10 years 461 295
Fair value, after 10 years 0 0
Total fair value 81,268 92,290
State and municipal    
Amoritzed cost    
Amortized cost, due within 1 year 13 19
Amortized cost, after 1 but within 5 years 106 94
Amortized cost, after 5 but within 10 years 326 305
Amortized cost, after 10 years 1,759 1,945
Amortized cost 2,204 2,363
Fair value    
Fair value, due within 1 year 12 18
Fair value, after 1 but within 5 years 103 92
Fair value, after 5 but within 10 years 310 302
Fair value, after 10 years 1,606 1,811
Total fair value 2,031 2,223
Foreign government    
Amoritzed cost    
Amortized cost, due within 1 year 60,383 64,795
Amortized cost, after 1 but within 5 years 60,881 67,935
Amortized cost, after 5 but within 10 years 5,490 2,491
Amortized cost, after 10 years 491 427
Amortized cost 127,245 135,648
Fair value    
Fair value, due within 1 year 59,996 64,479
Fair value, after 1 but within 5 years 59,656 66,150
Fair value, after 5 but within 10 years 5,326 2,250
Fair value, after 10 years 418 398
Total fair value 125,396 133,277
All other    
Amoritzed cost    
Amortized cost, due within 1 year 6,169 4,452
Amortized cost, after 1 but within 5 years 6,172 5,162
Amortized cost, after 5 but within 10 years 818 695
Amortized cost, after 10 years 65 57
Amortized cost 13,224 10,366
Fair value    
Fair value, due within 1 year 6,161 4,441
Fair value, after 1 but within 5 years 5,962 4,988
Fair value, after 5 but within 10 years 813 693
Fair value, after 10 years 29 18
Total fair value 12,965 10,140
Debt securities AFS    
Amoritzed cost    
Amortized cost 247,305 255,608
Fair value    
Total fair value 241,783 $ 249,679
Cumulative basis adjustments $ (500)