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INVESTMENTS - Fixed Maturities Available-for-sale (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value $ 11,533 $ 12,732
Less than 12 months, gross unrealized losses 145 249
12 months or longer, fair value 37,600 37,958
12 months or longer, gross unrealized losses 7,576 8,188
Total fair value 49,133 50,690
Total gross unrealized losses 7,721 8,437
Corporate    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 7,477 9,147
Less than 12 months, gross unrealized losses 121 205
12 months or longer, fair value 28,052 28,684
12 months or longer, gross unrealized losses 5,515 5,901
Total fair value 35,529 37,831
Total gross unrealized losses 5,636 6,106
U.S. Treasury, government and agency    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 106 117
Less than 12 months, gross unrealized losses 2 4
12 months or longer, fair value 4,284 4,107
12 months or longer, gross unrealized losses 1,357 1,509
Total fair value 4,390 4,224
Total gross unrealized losses 1,359 1,513
States and political subdivisions    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 0 40
Less than 12 months, gross unrealized losses 0 0
12 months or longer, fair value 276 271
12 months or longer, gross unrealized losses 83 88
Total fair value 276 311
Total gross unrealized losses 83 88
Foreign governments    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 26 59
Less than 12 months, gross unrealized losses 0 1
12 months or longer, fair value 462 460
12 months or longer, gross unrealized losses 126 135
Total fair value 488 519
Total gross unrealized losses 126 136
Residential mortgage-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 799 1,986
Less than 12 months, gross unrealized losses 8 26
12 months or longer, fair value 858 851
12 months or longer, gross unrealized losses 108 126
Total fair value 1,657 2,837
Total gross unrealized losses 116 152
Asset-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 2,684 974
Less than 12 months, gross unrealized losses 11 7
12 months or longer, fair value 763 692
12 months or longer, gross unrealized losses 52 50
Total fair value 3,447 1,666
Total gross unrealized losses 63 57
Commercial mortgage-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 441 409
Less than 12 months, gross unrealized losses 3 6
12 months or longer, fair value 2,905 2,893
12 months or longer, gross unrealized losses 335 379
Total fair value 3,346 3,302
Total gross unrealized losses $ 338 $ 385