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INVESTMENTS - Fixed Maturities Available-for-sale (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value $ 7,142 $ 3,194
Less than 12 months, gross unrealized losses 182 144
12 months or longer, fair value 42,615 47,821
12 months or longer, gross unrealized losses 7,810 7,261
Total fair value 49,757 51,015
Total gross unrealized losses 7,992 7,405
Corporate    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 4,228 2,228
Less than 12 months, gross unrealized losses 158 126
12 months or longer, fair value 31,870 33,135
12 months or longer, gross unrealized losses 5,702 5,231
Total fair value 36,098 35,363
Total gross unrealized losses 5,860 5,357
U.S. government, agencies and authorities    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 101 111
Less than 12 months, gross unrealized losses 2 2
12 months or longer, fair value 4,320 4,447
12 months or longer, gross unrealized losses 1,262 1,104
Total fair value 4,421 4,558
Total gross unrealized losses 1,264 1,106
States and political subdivisions    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 10 10
Less than 12 months, gross unrealized losses 0 0
12 months or longer, fair value 304 300
12 months or longer, gross unrealized losses 79 74
Total fair value 314 310
Total gross unrealized losses 79 74
Foreign governments    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 56 15
Less than 12 months, gross unrealized losses 2 2
12 months or longer, fair value 487 517
12 months or longer, gross unrealized losses 120 109
Total fair value 543 532
Total gross unrealized losses 122 111
Residential mortgage-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 612 210
Less than 12 months, gross unrealized losses 7 2
12 months or longer, fair value 1,008 1,044
12 months or longer, gross unrealized losses 141 131
Total fair value 1,620 1,254
Total gross unrealized losses 148 133
Asset-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 2,087 528
Less than 12 months, gross unrealized losses 5 1
12 months or longer, fair value 1,737 5,522
12 months or longer, gross unrealized losses 80 108
Total fair value 3,824 6,050
Total gross unrealized losses 85 109
Commercial mortgage-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 48 92
Less than 12 months, gross unrealized losses 8 11
12 months or longer, fair value 2,889 2,856
12 months or longer, gross unrealized losses 426 504
Total fair value 2,937 2,948
Total gross unrealized losses $ 434 $ 515