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INVESTMENTS - Fair Value of AFS Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Fair value    
Less than 12 months $ 96,639 $ 138,567
12 months or longer 78,078 53,695
Total 174,717 192,262
Gross unrealized losses    
Less than 12 months 2,713 3,997
12 months or longer 2,938 2,607
Total 5,651 6,604
Mortgage-backed securities - U.S. government-sponsored agency guaranteed    
Fair value    
Less than 12 months 2,315 7,908
12 months or longer 8,799 3,290
Total 11,114 11,198
Gross unrealized losses    
Less than 12 months 74 412
12 months or longer 601 343
Total 675 755
Residential mortgages    
Fair value    
Less than 12 months 325 158
12 months or longer 0 1
Total 325 159
Gross unrealized losses    
Less than 12 months 3 3
12 months or longer 0 0
Total 3 3
Commercial    
Fair value    
Less than 12 months 0 1
12 months or longer 2 1
Total 2 2
Gross unrealized losses    
Less than 12 months 0 0
12 months or longer 0 0
Total 0 0
Mortgage-backed securities    
Fair value    
Less than 12 months 2,640 8,067
12 months or longer 8,801 3,292
Total 11,441 11,359
Gross unrealized losses    
Less than 12 months 77 415
12 months or longer 601 343
Total 678 758
U.S. Treasury    
Fair value    
Less than 12 months 24,255 40,701
12 months or longer 47,036 34,692
Total 71,291 75,393
Gross unrealized losses    
Less than 12 months 657 1,001
12 months or longer 1,426 1,491
Total 2,083 2,492
Agency obligations    
Fair value    
Less than 12 months 0 0
12 months or longer 0 0
Total 0 0
Gross unrealized losses    
Less than 12 months 0 0
12 months or longer 0 0
Total 0 0
U.S. Treasury and federal agency securities    
Fair value    
Less than 12 months 24,255 40,701
12 months or longer 47,036 34,692
Total 71,291 75,393
Gross unrealized losses    
Less than 12 months 657 1,001
12 months or longer 1,426 1,491
Total 2,083 2,492
State and municipal    
Fair value    
Less than 12 months 266 896
12 months or longer 1,064 707
Total 1,330 1,603
Gross unrealized losses    
Less than 12 months 8 31
12 months or longer 117 128
Total 125 159
Foreign government    
Fair value    
Less than 12 months 63,717 82,900
12 months or longer 19,972 14,220
Total 83,689 97,120
Gross unrealized losses    
Less than 12 months 1,778 2,332
12 months or longer 751 608
Total 2,529 2,940
Corporate    
Fair value    
Less than 12 months 3,205 3,082
12 months or longer 1,202 784
Total 4,407 3,866
Gross unrealized losses    
Less than 12 months 187 209
12 months or longer 43 37
Total 230 246
Asset-backed securities    
Fair value    
Less than 12 months 695 708
12 months or longer 3 0
Total 698 708
Gross unrealized losses    
Less than 12 months 2 4
12 months or longer 0 0
Total 2 4
Other debt securities    
Fair value    
Less than 12 months 1,861 2,213
12 months or longer 0 0
Total 1,861 2,213
Gross unrealized losses    
Less than 12 months 4 5
12 months or longer 0 0
Total $ 4 $ 5