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INVESTMENTS - Fair Value of AFS Debt Securities by Contractual Maturity Date (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Fair value    
Total fair value $ 254,898.0 $ 256,936.0
Unallocated portfolio layer cumulative basis adjustments (113.0) 93.0
Mortgage-backed securities    
Amoritzed cost    
Amortized cost, due within 1 year 26.0  
Amortized cost, after 1 but within 5 years 775.0  
Amortized cost, after 5 but within 10 years 466.0  
Amortized cost, after 10 years 31,924.0  
Amortized cost 33,191.0  
Fair value    
Fair value, due within 1 year 26.0  
Fair value, after 1 but within 5 years 763.0  
Fair value, after 5 but within 10 years 438.0  
Fair value, after 10 years 31,243.0  
Total fair value 32,470.0 30,139.0
U.S. Treasury and federal agency securities    
Amoritzed cost    
Amortized cost, due within 1 year 42,338.0  
Amortized cost, after 1 but within 5 years 33,351.0  
Amortized cost, after 5 but within 10 years 517.0  
Amortized cost, after 10 years 0.0  
Amortized cost 76,206.0  
Fair value    
Fair value, due within 1 year 42,004.0  
Fair value, after 1 but within 5 years 32,554.0  
Fair value, after 5 but within 10 years 475.0  
Fair value, after 10 years 0.0  
Total fair value 75,033.0 80,361.0
State and municipal    
Amoritzed cost    
Amortized cost, due within 1 year 11.0  
Amortized cost, after 1 but within 5 years 131.0  
Amortized cost, after 5 but within 10 years 393.0  
Amortized cost, after 10 years 1,529.0  
Amortized cost 2,064.0  
Fair value    
Fair value, due within 1 year 11.0  
Fair value, after 1 but within 5 years 127.0  
Fair value, after 5 but within 10 years 383.0  
Fair value, after 10 years 1,467.0  
Total fair value 1,988.0 2,131.0
Foreign government    
Amoritzed cost    
Amortized cost, due within 1 year 62,481.0  
Amortized cost, after 1 but within 5 years 66,860.0  
Amortized cost, after 5 but within 10 years 4,694.0  
Amortized cost, after 10 years 544.0  
Amortized cost 134,579.0  
Fair value    
Fair value, due within 1 year 62,287.0  
Fair value, after 1 but within 5 years 66,288.0  
Fair value, after 5 but within 10 years 4,639.0  
Fair value, after 10 years 484.0  
Total fair value 133,698.0 131,198.0
All other    
Amoritzed cost    
Amortized cost, due within 1 year 5,786.0  
Amortized cost, after 1 but within 5 years 5,363.0  
Amortized cost, after 5 but within 10 years 667.0  
Amortized cost, after 10 years 63.0  
Amortized cost 11,879.0  
Fair value    
Fair value, due within 1 year 5,772.0  
Fair value, after 1 but within 5 years 5,243.0  
Fair value, after 5 but within 10 years 668.0  
Fair value, after 10 years 26.0  
Total fair value 11,709.0  
Debt securities AFS    
Amoritzed cost    
Amortized cost 257,919.0  
Fair value    
Total fair value 254,898.0 $ 256,936.0
Unallocated portfolio layer cumulative basis adjustments $ (100.0)