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INVESTMENTS - Fixed Maturities Available-for-sale (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value $ 3,194 $ 39,169
Less than 12 months, gross unrealized losses 144 4,415
12 months or longer, fair value 47,821 20,816
12 months or longer, gross unrealized losses 7,261 5,295
Total fair value 51,015 59,985
Total gross unrealized losses 7,405 9,710
Corporate    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 2,228 24,580
Less than 12 months, gross unrealized losses 126 2,668
12 months or longer, fair value 33,135 16,534
12 months or longer, gross unrealized losses 5,231 4,536
Total fair value 35,363 41,114
Total gross unrealized losses 5,357 7,204
U.S. government, agencies and authorities    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 111 5,564
Less than 12 months, gross unrealized losses 2 1,200
12 months or longer, fair value 4,447 204
12 months or longer, gross unrealized losses 1,104 18
Total fair value 4,558 5,768
Total gross unrealized losses 1,106 1,218
States and political subdivisions    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 10 130
Less than 12 months, gross unrealized losses 0 25
12 months or longer, fair value 300 173
12 months or longer, gross unrealized losses 74 64
Total fair value 310 303
Total gross unrealized losses 74 89
Foreign governments    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 15 349
Less than 12 months, gross unrealized losses 2 42
12 months or longer, fair value 517 417
12 months or longer, gross unrealized losses 109 109
Total fair value 532 766
Total gross unrealized losses 111 151
Residential mortgage-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 210 671
Less than 12 months, gross unrealized losses 2 49
12 months or longer, fair value 1,044 83
12 months or longer, gross unrealized losses 131 38
Total fair value 1,254 754
Total gross unrealized losses 133 87
Asset-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 528 6,298
Less than 12 months, gross unrealized losses 1 230
12 months or longer, fair value 5,522 1,765
12 months or longer, gross unrealized losses 108 143
Total fair value 6,050 8,063
Total gross unrealized losses 109 373
Commercial mortgage-backed    
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 92 1,577
Less than 12 months, gross unrealized losses 11 201
12 months or longer, fair value 2,856 1,640
12 months or longer, gross unrealized losses 504 387
Total fair value 2,948 3,217
Total gross unrealized losses $ 515 $ 588