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INVESTMENTS - Fair Value of AFS Debt Securities by Contractual Maturity Date (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Fair value    
Total fair value $ 237,334 $ 249,679
Cumulative basis adjustments (200)  
Mortgage-backed securities    
Amoritzed cost    
Amortized cost, due within 1 year 4 42
Amortized cost, after 1 but within 5 years 403 523
Amortized cost, after 5 but within 10 years 500 468
Amortized cost, after 10 years 15,214 11,466
Amortized cost 16,121 12,499
Fair value    
Fair value, due within 1 year 4 44
Fair value, after 1 but within 5 years 393 513
Fair value, after 5 but within 10 years 473 440
Fair value, after 10 years 14,432 10,752
Total fair value 15,302 11,749
U.S. Treasury and federal agency securities    
Amoritzed cost    
Amortized cost, due within 1 year 25,343 25,935
Amortized cost, after 1 but within 5 years 58,339 68,455
Amortized cost, after 5 but within 10 years 568 342
Amortized cost, after 10 years 0 0
Amortized cost 84,250 94,732
Fair value    
Fair value, due within 1 year 25,156 25,829
Fair value, after 1 but within 5 years 56,565 66,166
Fair value, after 5 but within 10 years 522 295
Fair value, after 10 years 0 0
Total fair value 82,243 92,290
State and municipal    
Amoritzed cost    
Amortized cost, due within 1 year 14 19
Amortized cost, after 1 but within 5 years 93 94
Amortized cost, after 5 but within 10 years 279 305
Amortized cost, after 10 years 1,919 1,945
Amortized cost 2,305 2,363
Fair value    
Fair value, due within 1 year 12 18
Fair value, after 1 but within 5 years 92 92
Fair value, after 5 but within 10 years 275 302
Fair value, after 10 years 1,823 1,811
Total fair value 2,202 2,223
Foreign government    
Amoritzed cost    
Amortized cost, due within 1 year 55,587 64,795
Amortized cost, after 1 but within 5 years 66,904 67,935
Amortized cost, after 5 but within 10 years 3,897 2,491
Amortized cost, after 10 years 579 427
Amortized cost 126,967 135,648
Fair value    
Fair value, due within 1 year 55,384 64,479
Fair value, after 1 but within 5 years 65,612 66,150
Fair value, after 5 but within 10 years 3,725 2,250
Fair value, after 10 years 549 398
Total fair value 125,270 133,277
All other    
Amoritzed cost    
Amortized cost, due within 1 year 5,763 4,452
Amortized cost, after 1 but within 5 years 6,174 5,162
Amortized cost, after 5 but within 10 years 588 695
Amortized cost, after 10 years 58 57
Amortized cost 12,583 10,366
Fair value    
Fair value, due within 1 year 5,759 4,441
Fair value, after 1 but within 5 years 5,962 4,988
Fair value, after 5 but within 10 years 583 693
Fair value, after 10 years 13 18
Total fair value 12,317 10,140
Debt securities AFS    
Amoritzed cost    
Amortized cost 242,226 255,608
Fair value    
Total fair value 237,334 249,679
Mortgage-backed securities - U.S. government-sponsored agency guaranteed    
Fair value    
Total fair value $ 14,963 $ 11,262