INVESTMENTS - Fixed Maturities Available-for-sale (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than twelve months, fair value	$ 5,500	$ 36,438
Less than 12 months, gross unrealized losses	251	4,262
12 months or longer, fair value	43,596	19,212
12 months or longer, gross unrealized losses	9,896	4,957
Total fair value	49,096	55,650
Total gross unrealized losses	10,147	9,219
Corporate
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than twelve months, fair value	4,098	22,034
Less than 12 months, gross unrealized losses	226	2,431
12 months or longer, fair value	29,132	15,014
12 months or longer, gross unrealized losses	7,139	4,222
Total fair value	33,230	37,048
Total gross unrealized losses	7,365	6,653
U.S. Treasury, government and agency
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than twelve months, fair value	169	5,465
Less than 12 months, gross unrealized losses	7	1,294
12 months or longer, fair value	3,908	204
12 months or longer, gross unrealized losses	1,557	18
Total fair value	4,077	5,669
Total gross unrealized losses	1,564	1,312
States and political subdivisions
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than twelve months, fair value	114	91
Less than 12 months, gross unrealized losses	1	18
12 months or longer, fair value	219	158
12 months or longer, gross unrealized losses	84	58
Total fair value	333	249
Total gross unrealized losses	85	76
Foreign governments
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than twelve months, fair value	17	349
Less than 12 months, gross unrealized losses	1	42
12 months or longer, fair value	556	418
12 months or longer, gross unrealized losses	159	109
Total fair value	573	767
Total gross unrealized losses	160	151
Residential mortgage-backed
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than twelve months, fair value	188	665
Less than 12 months, gross unrealized losses	5	49
12 months or longer, fair value	666	79
12 months or longer, gross unrealized losses	110	35
Total fair value	854	744
Total gross unrealized losses	115	84
Asset-backed
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than twelve months, fair value	785	6,262
Less than 12 months, gross unrealized losses	7	228
12 months or longer, fair value	6,216	1,759
12 months or longer, gross unrealized losses	193	143
Total fair value	7,001	8,021
Total gross unrealized losses	200	371
Commercial mortgage-backed
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than twelve months, fair value	129	1,572
Less than 12 months, gross unrealized losses	4	200
12 months or longer, fair value	2,899	1,580
12 months or longer, gross unrealized losses	654	372
Total fair value	3,028	3,152
Total gross unrealized losses	$ 658	$ 572