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INVESTMENTS - Fair Value of AFS Debt Securities by Contractual Maturity Date (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Fair value    
Total fair value $ 234,444 $ 256,936
Unallocated portfolio layer cumulative basis adjustments 299 93
Mortgage-backed securities    
Amoritzed cost    
Amortized cost, due within 1 year 19  
Amortized cost, after 1 but within 5 years 871  
Amortized cost, after 5 but within 10 years 567  
Amortized cost, after 10 years 31,117  
Amortized cost 32,574  
Fair value    
Fair value, due within 1 year 19  
Fair value, after 1 but within 5 years 863  
Fair value, after 5 but within 10 years 554  
Fair value, after 10 years 31,067  
Total fair value 32,503 30,139
U.S. Treasury and federal agency securities    
Amoritzed cost    
Amortized cost, due within 1 year 37,761  
Amortized cost, after 1 but within 5 years 22,105  
Amortized cost, after 5 but within 10 years 203  
Amortized cost, after 10 years 0  
Amortized cost 60,069  
Fair value    
Fair value, due within 1 year 37,448  
Fair value, after 1 but within 5 years 21,914  
Fair value, after 5 but within 10 years 182  
Fair value, after 10 years 0  
Total fair value 59,544 80,361
State and municipal    
Amoritzed cost    
Amortized cost, due within 1 year 12  
Amortized cost, after 1 but within 5 years 132  
Amortized cost, after 5 but within 10 years 478  
Amortized cost, after 10 years 1,334  
Amortized cost 1,956  
Fair value    
Fair value, due within 1 year 12  
Fair value, after 1 but within 5 years 127  
Fair value, after 5 but within 10 years 467  
Fair value, after 10 years 1,281  
Total fair value 1,887 2,131
Foreign government    
Amoritzed cost    
Amortized cost, due within 1 year 56,098  
Amortized cost, after 1 but within 5 years 68,476  
Amortized cost, after 5 but within 10 years 4,676  
Amortized cost, after 10 years 593  
Amortized cost 129,843  
Fair value    
Fair value, due within 1 year 56,077  
Fair value, after 1 but within 5 years 68,368  
Fair value, after 5 but within 10 years 4,662  
Fair value, after 10 years 533  
Total fair value 129,640 131,198
All other    
Amoritzed cost    
Amortized cost, due within 1 year 5,602  
Amortized cost, after 1 but within 5 years 4,465  
Amortized cost, after 5 but within 10 years 843  
Amortized cost, after 10 years 52  
Amortized cost 10,962  
Fair value    
Fair value, due within 1 year 5,593  
Fair value, after 1 but within 5 years 4,402  
Fair value, after 5 but within 10 years 846  
Fair value, after 10 years 29  
Total fair value 10,870  
Debt securities AFS    
Amoritzed cost    
Amortized cost 235,404  
Fair value    
Total fair value 234,444 $ 256,936
Unallocated portfolio layer cumulative basis adjustments $ 300