INVESTMENTS - Fixed Maturities Available-for-sale (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	$ 42,530	$ 7,343
Less than 12 months, gross unrealized losses	1,498	85
12 months or longer, fair value	25,436	29,324
12 months or longer, gross unrealized losses	7,362	5,761
Total fair value	67,966	36,667
Total gross unrealized losses	8,860	5,846
Corporate
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	23,852	4,286
Less than 12 months, gross unrealized losses	931	68
12 months or longer, fair value	18,402	21,138
12 months or longer, gross unrealized losses	5,001	3,942
Total fair value	42,254	25,424
Total gross unrealized losses	5,932	4,010
U.S. Treasury, government and agency
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	144	29
Less than 12 months, gross unrealized losses	5	0
12 months or longer, fair value	3,253	3,621
12 months or longer, gross unrealized losses	1,716	1,304
Total fair value	3,397	3,650
Total gross unrealized losses	1,721	1,304
States and political subdivisions
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	62	13
Less than 12 months, gross unrealized losses	2	0
12 months or longer, fair value	192	223
12 months or longer, gross unrealized losses	84	71
Total fair value	254	236
Total gross unrealized losses	86	71
Foreign governments
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	64	19
Less than 12 months, gross unrealized losses	2	0
12 months or longer, fair value	322	364
12 months or longer, gross unrealized losses	97	77
Total fair value	386	383
Total gross unrealized losses	99	77
Residential mortgage-backed
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	7,548	619
Less than 12 months, gross unrealized losses	271	3
12 months or longer, fair value	593	836
12 months or longer, gross unrealized losses	126	89
Total fair value	8,141	1,455
Total gross unrealized losses	397	92
Asset-backed
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	8,926	2,114
Less than 12 months, gross unrealized losses	243	12
12 months or longer, fair value	522	580
12 months or longer, gross unrealized losses	38	30
Total fair value	9,448	2,694
Total gross unrealized losses	281	42
Commercial mortgage-backed
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	1,934	263
Less than 12 months, gross unrealized losses	44	2
12 months or longer, fair value	2,152	2,562
12 months or longer, gross unrealized losses	300	248
Total fair value	4,086	2,825
Total gross unrealized losses	$ 344	$ 250

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