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INVESTMENTS - Fair Value of AFS Debt Securities by Contractual Maturity Date (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair value    
Total fair value $ 246,227 $ 226,876
Unallocated portfolio layer cumulative basis adjustments   (72)
Mortgage-backed securities    
Amoritzed cost    
Amortized cost, due within 1 year 7  
Amortized cost, after 1 but within 5 years 1,229  
Amortized cost, after 5 but within 10 years 684  
Amortized cost, after 10 years 35,122  
Amortized cost 37,042  
Fair value    
Fair value, due within 1 year 7  
Fair value, after 1 but within 5 years 1,225  
Fair value, after 5 but within 10 years 670  
Fair value, after 10 years 34,746  
Total fair value 36,648 29,931
U.S. Treasury and federal agency securities    
Amoritzed cost    
Amortized cost, due within 1 year 19,042  
Amortized cost, after 1 but within 5 years 17,777  
Amortized cost, after 5 but within 10 years 244  
Amortized cost, after 10 years 0  
Amortized cost 37,063  
Fair value    
Fair value, due within 1 year 18,990  
Fair value, after 1 but within 5 years 17,803  
Fair value, after 5 but within 10 years 225  
Fair value, after 10 years 0  
Total fair value 37,018 52,379
State and municipal    
Amoritzed cost    
Amortized cost, due within 1 year 72  
Amortized cost, after 1 but within 5 years 98  
Amortized cost, after 5 but within 10 years 382  
Amortized cost, after 10 years 1,206  
Amortized cost 1,758  
Fair value    
Fair value, due within 1 year 72  
Fair value, after 1 but within 5 years 94  
Fair value, after 5 but within 10 years 375  
Fair value, after 10 years 1,150  
Total fair value 1,691 1,658
Foreign government    
Amoritzed cost    
Amortized cost, due within 1 year 69,045  
Amortized cost, after 1 but within 5 years 87,276  
Amortized cost, after 5 but within 10 years 4,297  
Amortized cost, after 10 years 581  
Amortized cost 161,199  
Fair value    
Fair value, due within 1 year 68,935  
Fair value, after 1 but within 5 years 87,919  
Fair value, after 5 but within 10 years 4,264  
Fair value, after 10 years 523  
Total fair value 161,641 133,359
All other    
Amoritzed cost    
Amortized cost, due within 1 year 4,064  
Amortized cost, after 1 but within 5 years 4,592  
Amortized cost, after 5 but within 10 years 561  
Amortized cost, after 10 years 49  
Amortized cost 9,266  
Fair value    
Fair value, due within 1 year 4,057  
Fair value, after 1 but within 5 years 4,580  
Fair value, after 5 but within 10 years 564  
Fair value, after 10 years 28  
Total fair value 9,229  
Debt securities AFS    
Amoritzed cost    
Amortized cost 246,328  
Fair value    
Total fair value 246,227 226,876
Unallocated portfolio layer cumulative basis adjustments $ 300 $ (200)