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INVESTMENTS - Fixed Maturities Available-for-sale (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value $ 11,868 $ 39,169
Less than 12 months, gross unrealized losses 518 4,415
12 months or longer, fair value 47,460 20,816
12 months or longer, gross unrealized losses 8,269 5,295
Total fair value 59,328 59,985
Total gross unrealized losses 8,787 9,710
Corporate    
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 8,135 24,580
Less than 12 months, gross unrealized losses 322 2,668
12 months or longer, fair value 31,883 16,534
12 months or longer, gross unrealized losses 6,173 4,536
Total fair value 40,018 41,114
Total gross unrealized losses 6,495 7,204
U.S. government, agencies and authorities    
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 1,508 5,564
Less than 12 months, gross unrealized losses 166 1,200
12 months or longer, fair value 4,320 204
12 months or longer, gross unrealized losses 938 18
Total fair value 5,828 5,768
Total gross unrealized losses 1,104 1,218
States and political subdivisions    
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 65 130
Less than 12 months, gross unrealized losses 1 25
12 months or longer, fair value 277 173
12 months or longer, gross unrealized losses 77 64
Total fair value 342 303
Total gross unrealized losses 78 89
Foreign governments    
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 58 349
Less than 12 months, gross unrealized losses 3 42
12 months or longer, fair value 615 417
12 months or longer, gross unrealized losses 126 109
Total fair value 673 766
Total gross unrealized losses 129 151
Residential mortgage-backed    
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 520 671
Less than 12 months, gross unrealized losses 7 49
12 months or longer, fair value 658 83
12 months or longer, gross unrealized losses 93 38
Total fair value 1,178 754
Total gross unrealized losses 100 87
Asset-backed    
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 1,347 6,298
Less than 12 months, gross unrealized losses 11 230
12 months or longer, fair value 6,718 1,765
12 months or longer, gross unrealized losses 270 143
Total fair value 8,065 8,063
Total gross unrealized losses 281 373
Commercial mortgage-backed    
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 235 1,577
Less than 12 months, gross unrealized losses 8 201
12 months or longer, fair value 2,989 1,640
12 months or longer, gross unrealized losses 592 387
Total fair value 3,224 3,217
Total gross unrealized losses $ 600 $ 588