INVESTMENTS - Fixed Maturities Available-for-sale (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	$ 21,579	$ 7,343
Less than 12 months, gross unrealized losses	287	85
12 months or longer, fair value	27,437	29,324
12 months or longer, gross unrealized losses	5,967	5,761
Total fair value	49,016	36,667
Total gross unrealized losses	6,254	5,846
Corporate
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	11,220	4,286
Less than 12 months, gross unrealized losses	179	68
12 months or longer, fair value	19,814	21,138
12 months or longer, gross unrealized losses	4,074	3,942
Total fair value	31,034	25,424
Total gross unrealized losses	4,253	4,010
U.S. Treasury, government and agency
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	104	29
Less than 12 months, gross unrealized losses	2	0
12 months or longer, fair value	3,586	3,621
12 months or longer, gross unrealized losses	1,371	1,304
Total fair value	3,690	3,650
Total gross unrealized losses	1,373	1,304
States and political subdivisions
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	13	13
Less than 12 months, gross unrealized losses	0	0
12 months or longer, fair value	219	223
12 months or longer, gross unrealized losses	70	71
Total fair value	232	236
Total gross unrealized losses	70	71
Foreign governments
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	14	19
Less than 12 months, gross unrealized losses	0	0
12 months or longer, fair value	345	364
12 months or longer, gross unrealized losses	75	77
Total fair value	359	383
Total gross unrealized losses	75	77
Residential mortgage-backed
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	3,874	619
Less than 12 months, gross unrealized losses	35	3
12 months or longer, fair value	655	836
12 months or longer, gross unrealized losses	92	89
Total fair value	4,529	1,455
Total gross unrealized losses	127	92
Asset-backed
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	5,517	2,114
Less than 12 months, gross unrealized losses	64	12
12 months or longer, fair value	498	580
12 months or longer, gross unrealized losses	31	30
Total fair value	6,015	2,694
Total gross unrealized losses	95	42
Commercial mortgage-backed
Available-For-Sale Securities, Continuous Unrealized Loss Position [Line Items]
Less than 12 months, fair value	837	263
Less than 12 months, gross unrealized losses	7	2
12 months or longer, fair value	2,320	2,562
12 months or longer, gross unrealized losses	254	248
Total fair value	3,157	2,825
Total gross unrealized losses	$ 261	$ 250

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