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INVESTMENTS - Fair Value of AFS Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Fair value    
Less than 12 months $ 140,684 $ 144,333
12 months or longer 50,196 17,829
Total 190,880 162,162
Gross unrealized losses    
Less than 12 months 4,752 1,895
12 months or longer 2,887 457
Total 7,639 2,352
Residential mortgages    
Gross unrealized losses    
Amortized cost 479 380
Mortgage-backed securities - U.S. government-sponsored agency guaranteed    
Fair value    
Less than 12 months 9,471 17,039
12 months or longer 1,922 698
Total 11,393 17,737
Gross unrealized losses    
Less than 12 months 615 270
12 months or longer 275 31
Total 890 301
Residential mortgages    
Fair value    
Less than 12 months 46  
12 months or longer 0  
Total 46  
Gross unrealized losses    
Less than 12 months 3  
12 months or longer 0  
Total 3  
Mortgage-backed securities - Non-U.S. residential    
Fair value    
Less than 12 months   96
12 months or longer   1
Total   97
Gross unrealized losses    
Less than 12 months   1
12 months or longer   0
Total   1
Commercial    
Fair value    
Less than 12 months 3 0
12 months or longer 1 0
Total 4 0
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 9,520 17,135
12 months or longer 1,923 699
Total 11,443 17,834
Gross unrealized losses    
Less than 12 months 618 271
12 months or longer 275 31
Total 893 302
U.S. Treasury    
Fair value    
Less than 12 months 44,899 56,448
12 months or longer 33,305 6,310
Total 78,204 62,758
Gross unrealized losses    
Less than 12 months 1,300 713
12 months or longer 1,673 131
Total 2,973 844
Agency obligations    
Fair value    
Less than 12 months   0
12 months or longer   0
Total   0
Gross unrealized losses    
Less than 12 months   0
12 months or longer   0
Total   0
U.S. Treasury and federal agency securities    
Fair value    
Less than 12 months   56,448
12 months or longer   6,310
Total   62,758
Gross unrealized losses    
Less than 12 months   713
12 months or longer   131
Total   844
State and municipal    
Fair value    
Less than 12 months 488 229
12 months or longer 1,308 874
Total 1,796 1,103
Gross unrealized losses    
Less than 12 months 40 3
12 months or longer 183 98
Total 223 101
Foreign government    
Fair value    
Less than 12 months 79,279 64,319
12 months or longer 13,266 9,924
Total 92,545 74,243
Gross unrealized losses    
Less than 12 months 2,514 826
12 months or longer 730 197
Total 3,244 1,023
Corporate    
Fair value    
Less than 12 months 4,068 2,655
12 months or longer 394 22
Total 4,462 2,677
Gross unrealized losses    
Less than 12 months 270 77
12 months or longer 26 0
Total 296 77
Asset-backed securities    
Fair value    
Less than 12 months 159 108
12 months or longer 0 0
Total 159 108
Gross unrealized losses    
Less than 12 months 2 1
12 months or longer 0 0
Total 2 1
Other debt securities    
Fair value    
Less than 12 months 2,271 3,439
12 months or longer 0 0
Total 2,271 3,439
Gross unrealized losses    
Less than 12 months 8 4
12 months or longer 0 0
Total $ 8 $ 4