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INVESTMENTS - Fixed Maturities Available-for-sale (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value $ 3,040 $ 3,194
Less than 12 months, gross unrealized losses 76 144
12 months or longer, fair value 39,930 47,821
12 months or longer, gross unrealized losses 6,275 7,261
Total fair value 42,970 51,015
Total gross unrealized losses 6,351 7,405
Corporate    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 2,007 2,228
Less than 12 months, gross unrealized losses 66 126
12 months or longer, fair value 29,946 33,135
12 months or longer, gross unrealized losses 4,555 5,231
Total fair value 31,953 35,363
Total gross unrealized losses 4,621 5,357
U.S. Treasury, government and agency    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 53 111
Less than 12 months, gross unrealized losses 0 2
12 months or longer, fair value 4,527 4,447
12 months or longer, gross unrealized losses 1,082 1,104
Total fair value 4,580 4,558
Total gross unrealized losses 1,082 1,106
States and political subdivisions    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 0 10
Less than 12 months, gross unrealized losses 0 0
12 months or longer, fair value 289 300
12 months or longer, gross unrealized losses 69 74
Total fair value 289 310
Total gross unrealized losses 69 74
Foreign governments    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 10 15
Less than 12 months, gross unrealized losses 1 2
12 months or longer, fair value 503 517
12 months or longer, gross unrealized losses 99 109
Total fair value 513 532
Total gross unrealized losses 100 111
Residential mortgage-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 357 210
Less than 12 months, gross unrealized losses 1 2
12 months or longer, fair value 904 1,044
12 months or longer, gross unrealized losses 96 131
Total fair value 1,261 1,254
Total gross unrealized losses 97 133
Asset-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 479 528
Less than 12 months, gross unrealized losses 1 1
12 months or longer, fair value 830 5,522
12 months or longer, gross unrealized losses 44 108
Total fair value 1,309 6,050
Total gross unrealized losses 45 109
Commercial mortgage-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 134 92
Less than 12 months, gross unrealized losses 7 11
12 months or longer, fair value 2,931 2,856
12 months or longer, gross unrealized losses 330 504
Total fair value 3,065 2,948
Total gross unrealized losses $ 337 $ 515