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INVESTMENTS - Fixed Maturities Available-for-sale (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value $ 12,732 $ 3,194
Less than 12 months, gross unrealized losses 249 144
12 months or longer, fair value 37,958 47,821
12 months or longer, gross unrealized losses 8,188 7,261
Total fair value 50,690 51,015
Total gross unrealized losses 8,437 7,405
Corporate    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 9,147 2,228
Less than 12 months, gross unrealized losses 205 126
12 months or longer, fair value 28,684 33,135
12 months or longer, gross unrealized losses 5,901 5,231
Total fair value 37,831 35,363
Total gross unrealized losses 6,106 5,357
U.S. Treasury, government and agency    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 117 111
Less than 12 months, gross unrealized losses 4 2
12 months or longer, fair value 4,107 4,447
12 months or longer, gross unrealized losses 1,509 1,104
Total fair value 4,224 4,558
Total gross unrealized losses 1,513 1,106
States and political subdivisions    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 40 10
Less than 12 months, gross unrealized losses 0 0
12 months or longer, fair value 271 300
12 months or longer, gross unrealized losses 88 74
Total fair value 311 310
Total gross unrealized losses 88 74
Foreign governments    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 59 15
Less than 12 months, gross unrealized losses 1 2
12 months or longer, fair value 460 517
12 months or longer, gross unrealized losses 135 109
Total fair value 519 532
Total gross unrealized losses 136 111
Residential mortgage-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 1,986 210
Less than 12 months, gross unrealized losses 26 2
12 months or longer, fair value 851 1,044
12 months or longer, gross unrealized losses 126 131
Total fair value 2,837 1,254
Total gross unrealized losses 152 133
Asset-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 974 528
Less than 12 months, gross unrealized losses 7 1
12 months or longer, fair value 692 5,522
12 months or longer, gross unrealized losses 50 108
Total fair value 1,666 6,050
Total gross unrealized losses 57 109
Commercial mortgage-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 409 92
Less than 12 months, gross unrealized losses 6 11
12 months or longer, fair value 2,893 2,856
12 months or longer, gross unrealized losses 379 504
Total fair value 3,302 2,948
Total gross unrealized losses $ 385 $ 515