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INVESTMENTS - Fixed Maturities Available-for-sale (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value $ 9,144 $ 3,194
Less than 12 months, gross unrealized losses 167 144
12 months or longer, fair value 41,739 47,821
12 months or longer, gross unrealized losses 8,333 7,261
Total fair value 50,883 51,015
Total gross unrealized losses 8,500 7,405
Corporate    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 5,860 2,228
Less than 12 months, gross unrealized losses 143 126
12 months or longer, fair value 31,508 33,135
12 months or longer, gross unrealized losses 6,118 5,231
Total fair value 37,368 35,363
Total gross unrealized losses 6,261 5,357
U.S. Treasury, government and agency    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 15 111
Less than 12 months, gross unrealized losses 0 2
12 months or longer, fair value 4,333 4,447
12 months or longer, gross unrealized losses 1,362 1,104
Total fair value 4,348 4,558
Total gross unrealized losses 1,362 1,106
States and political subdivisions    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 65 10
Less than 12 months, gross unrealized losses 0 0
12 months or longer, fair value 276 300
12 months or longer, gross unrealized losses 84 74
Total fair value 341 310
Total gross unrealized losses 84 74
Foreign governments    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 64 15
Less than 12 months, gross unrealized losses 2 2
12 months or longer, fair value 482 517
12 months or longer, gross unrealized losses 126 109
Total fair value 546 532
Total gross unrealized losses 128 111
Residential mortgage-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 1,136 210
Less than 12 months, gross unrealized losses 8 2
12 months or longer, fair value 1,051 1,044
12 months or longer, gross unrealized losses 142 131
Total fair value 2,187 1,254
Total gross unrealized losses 150 133
Asset-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 1,763 528
Less than 12 months, gross unrealized losses 5 1
12 months or longer, fair value 1,228 5,522
12 months or longer, gross unrealized losses 71 108
Total fair value 2,991 6,050
Total gross unrealized losses 76 109
Commercial mortgage-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 241 92
Less than 12 months, gross unrealized losses 9 11
12 months or longer, fair value 2,861 2,856
12 months or longer, gross unrealized losses 430 504
Total fair value 3,102 2,948
Total gross unrealized losses $ 439 $ 515