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INVESTMENTS - Fixed Maturities Available-for-sale (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value $ 6,477 $ 12,732
Less than 12 months, gross unrealized losses 76 249
12 months or longer, fair value 36,489 37,958
12 months or longer, gross unrealized losses 7,415 8,188
Total fair value 42,966 50,690
Total gross unrealized losses 7,491 8,437
Corporate    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 4,283 9,147
Less than 12 months, gross unrealized losses 61 205
12 months or longer, fair value 27,192 28,684
12 months or longer, gross unrealized losses 5,299 5,901
Total fair value 31,475 37,831
Total gross unrealized losses 5,360 6,106
U.S. Treasury, government and agency    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 67 117
Less than 12 months, gross unrealized losses 1 4
12 months or longer, fair value 4,210 4,107
12 months or longer, gross unrealized losses 1,466 1,509
Total fair value 4,277 4,224
Total gross unrealized losses 1,467 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 261 271
12 months or longer, gross unrealized losses 84 88
Total fair value 261 311
Total gross unrealized losses 84 88
Foreign governments    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 19 59
Less than 12 months, gross unrealized losses 0 1
12 months or longer, fair value 459 460
12 months or longer, gross unrealized losses 117 135
Total fair value 478 519
Total gross unrealized losses 117 136
Residential mortgage-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 488 1,986
Less than 12 months, gross unrealized losses 4 26
12 months or longer, fair value 826 851
12 months or longer, gross unrealized losses 107 126
Total fair value 1,314 2,837
Total gross unrealized losses 111 152
Asset-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 1,334 974
Less than 12 months, gross unrealized losses 9 7
12 months or longer, fair value 672 692
12 months or longer, gross unrealized losses 40 50
Total fair value 2,006 1,666
Total gross unrealized losses 49 57
Commercial mortgage-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 286 409
Less than 12 months, gross unrealized losses 1 6
12 months or longer, fair value 2,869 2,893
12 months or longer, gross unrealized losses 302 379
Total fair value 3,155 3,302
Total gross unrealized losses $ 303 $ 385