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INVESTMENTS - Fair Value of AFS Debt Securities by Contractual Maturity Date (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Fair value    
Total fair value $ 249,362 $ 256,936
Unallocated portfolio layer cumulative basis adjustments (213) 93
Mortgage-backed securities    
Amoritzed cost    
Amortized cost, due within 1 year 25  
Amortized cost, after 1 but within 5 years 837  
Amortized cost, after 5 but within 10 years 583  
Amortized cost, after 10 years 31,869  
Amortized cost 33,314  
Fair value    
Fair value, due within 1 year 25  
Fair value, after 1 but within 5 years 824  
Fair value, after 5 but within 10 years 554  
Fair value, after 10 years 30,956  
Total fair value 32,359 30,139
U.S. Treasury and federal agency securities    
Amoritzed cost    
Amortized cost, due within 1 year 38,155  
Amortized cost, after 1 but within 5 years 31,931  
Amortized cost, after 5 but within 10 years 518  
Amortized cost, after 10 years 0  
Amortized cost 70,604  
Fair value    
Fair value, due within 1 year 37,980  
Fair value, after 1 but within 5 years 31,178  
Fair value, after 5 but within 10 years 474  
Fair value, after 10 years 0  
Total fair value 69,632 80,361
State and municipal    
Amoritzed cost    
Amortized cost, due within 1 year 12  
Amortized cost, after 1 but within 5 years 129  
Amortized cost, after 5 but within 10 years 372  
Amortized cost, after 10 years 1,457  
Amortized cost 1,970  
Fair value    
Fair value, due within 1 year 12  
Fair value, after 1 but within 5 years 124  
Fair value, after 5 but within 10 years 360  
Fair value, after 10 years 1,393  
Total fair value 1,889 2,131
Foreign government    
Amoritzed cost    
Amortized cost, due within 1 year 63,763  
Amortized cost, after 1 but within 5 years 65,845  
Amortized cost, after 5 but within 10 years 4,987  
Amortized cost, after 10 years 549  
Amortized cost 135,144  
Fair value    
Fair value, due within 1 year 63,617  
Fair value, after 1 but within 5 years 65,097  
Fair value, after 5 but within 10 years 4,914  
Fair value, after 10 years 471  
Total fair value 134,099 131,198
All other    
Amoritzed cost    
Amortized cost, due within 1 year 6,450  
Amortized cost, after 1 but within 5 years 4,397  
Amortized cost, after 5 but within 10 years 634  
Amortized cost, after 10 years 60  
Amortized cost 11,541  
Fair value    
Fair value, due within 1 year 6,427  
Fair value, after 1 but within 5 years 4,290  
Fair value, after 5 but within 10 years 635  
Fair value, after 10 years 31  
Total fair value 11,383  
Debt securities AFS    
Amoritzed cost    
Amortized cost 252,573  
Fair value    
Total fair value 249,362 $ 256,936
Unallocated portfolio layer cumulative basis adjustments $ (200)