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INVESTMENTS - Fair Value of AFS Debt Securities by Contractual Maturity Date (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Fair value    
Total fair value $ 225,180 $ 226,876
Unallocated portfolio layer cumulative basis adjustments   (72)
Mortgage-backed securities    
Amoritzed cost    
Amortized cost, due within 1 year 4  
Amortized cost, after 1 but within 5 years 1,016  
Amortized cost, after 5 but within 10 years 558  
Amortized cost, after 10 years 34,658  
Amortized cost 36,236  
Fair value    
Fair value, due within 1 year 4  
Fair value, after 1 but within 5 years 1,009  
Fair value, after 5 but within 10 years 535  
Fair value, after 10 years 34,084  
Total fair value 35,632 29,931
U.S. Treasury and federal agency securities    
Amoritzed cost    
Amortized cost, due within 1 year 12,176  
Amortized cost, after 1 but within 5 years 21,750  
Amortized cost, after 5 but within 10 years 202  
Amortized cost, after 10 years 0  
Amortized cost 34,128  
Fair value    
Fair value, due within 1 year 12,146  
Fair value, after 1 but within 5 years 21,626  
Fair value, after 5 but within 10 years 180  
Fair value, after 10 years 0  
Total fair value 33,952 52,379
State and municipal    
Amoritzed cost    
Amortized cost, due within 1 year 10  
Amortized cost, after 1 but within 5 years 157  
Amortized cost, after 5 but within 10 years 335  
Amortized cost, after 10 years 1,256  
Amortized cost 1,758  
Fair value    
Fair value, due within 1 year 10  
Fair value, after 1 but within 5 years 152  
Fair value, after 5 but within 10 years 324  
Fair value, after 10 years 1,185  
Total fair value 1,671 1,658
Foreign government    
Amoritzed cost    
Amortized cost, due within 1 year 63,878  
Amortized cost, after 1 but within 5 years 72,380  
Amortized cost, after 5 but within 10 years 5,795  
Amortized cost, after 10 years 809  
Amortized cost 142,862  
Fair value    
Fair value, due within 1 year 63,846  
Fair value, after 1 but within 5 years 72,436  
Fair value, after 5 but within 10 years 5,707  
Fair value, after 10 years 734  
Total fair value 142,723 133,359
All other    
Amoritzed cost    
Amortized cost, due within 1 year 5,780  
Amortized cost, after 1 but within 5 years 4,834  
Amortized cost, after 5 but within 10 years 609  
Amortized cost, after 10 years 53  
Amortized cost 11,276  
Fair value    
Fair value, due within 1 year 5,771  
Fair value, after 1 but within 5 years 4,785  
Fair value, after 5 but within 10 years 610  
Fair value, after 10 years 36  
Total fair value 11,202  
Debt securities AFS    
Amoritzed cost    
Amortized cost 226,260  
Fair value    
Total fair value 225,180 226,876
Unallocated portfolio layer cumulative basis adjustments $ 200 $ (200)