INVESTMENTS - Fixed Maturities Available-for-sale (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Less than twelve months, fair value	$ 4,549	$ 2,196
Less than 12 months, gross unrealized losses	135	134
12 months or longer, fair value	37,809	44,061
12 months or longer, gross unrealized losses	7,823	6,836
Total fair value	42,358	46,257
Total gross unrealized losses	7,958	6,970
Corporate
Debt Securities, Available-for-sale [Line Items]
Less than twelve months, fair value	3,350	1,693
Less than 12 months, gross unrealized losses	120	119
12 months or longer, fair value	27,919	29,617
12 months or longer, gross unrealized losses	5,650	4,839
Total fair value	31,269	31,310
Total gross unrealized losses	5,770	4,958
U.S. Treasury, government and agency
Debt Securities, Available-for-sale [Line Items]
Less than twelve months, fair value	12	111
Less than 12 months, gross unrealized losses	0	2
12 months or longer, fair value	4,252	4,361
12 months or longer, gross unrealized losses	1,356	1,100
Total fair value	4,264	4,472
Total gross unrealized losses	1,356	1,102
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Less than twelve months, fair value	43	10
Less than 12 months, gross unrealized losses	0	0
12 months or longer, fair value	223	244
12 months or longer, gross unrealized losses	71	64
Total fair value	266	254
Total gross unrealized losses	71	64
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Less than twelve months, fair value	35	8
Less than 12 months, gross unrealized losses	2	1
12 months or longer, fair value	474	514
12 months or longer, gross unrealized losses	124	109
Total fair value	509	522
Total gross unrealized losses	126	110
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Less than twelve months, fair value	302	74
Less than 12 months, gross unrealized losses	2	1
12 months or longer, fair value	968	1,030
12 months or longer, gross unrealized losses	136	127
Total fair value	1,270	1,104
Total gross unrealized losses	138	128
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Less than twelve months, fair value	714	238
Less than 12 months, gross unrealized losses	2	0
12 months or longer, fair value	1,171	5,499
12 months or longer, gross unrealized losses	70	107
Total fair value	1,885	5,737
Total gross unrealized losses	72	107
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Less than twelve months, fair value	93	62
Less than 12 months, gross unrealized losses	9	11
12 months or longer, fair value	2,802	2,796
12 months or longer, gross unrealized losses	416	490
Total fair value	2,895	2,858
Total gross unrealized losses	$ 425	$ 501