INVESTMENTS - Schedule of Aggregate Fair Value and Gross Unrealized Depreciation of Fixed Maturity Securities - Available for Sale, by Security Type (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair Value
Less than 12 months	$ 2,768	$ 1,369
Greater than 12 months	5,161	6,187
Total	7,930	7,556
Gross Unrealized Depreciation
Less than 12 months	(51)	(55)
Greater than 12 months	(499)	(481)
Total	(550)	(536)
No Recorded Allowance for Credit Losses
Fair Value
Less than 12 months	2,735	1,367
Greater than 12 months	5,160	6,187
Total	7,895	7,554
Gross Unrealized Depreciation
Less than 12 months	(50)	(54)
Greater than 12 months	(499)	(481)
Total	(549)	(536)
U.S. government agencies and corporations
Fair Value
Less than 12 months	4	7
Greater than 12 months	238	238
Total	242	245
Gross Unrealized Depreciation
Less than 12 months	0	0
Greater than 12 months	(18)	(17)
Total	(18)	(17)
Obligations of U.S. states and political subdivisions
Fair Value
Less than 12 months	8	3
Greater than 12 months	63	74
Total	71	77
Gross Unrealized Depreciation
Less than 12 months	0	0
Greater than 12 months	(9)	(11)
Total	(10)	(11)
Corporate securities
Fair Value
Less than 12 months	1,125	673
Greater than 12 months	1,251	1,150
Total	2,376	1,822
Gross Unrealized Depreciation
Less than 12 months	(32)	(47)
Greater than 12 months	(124)	(112)
Total	(156)	(160)
Asset-backed securities
Fair Value
Less than 12 months	328	179
Greater than 12 months	895	1,958
Total	1,223	2,138
Gross Unrealized Depreciation
Less than 12 months	(2)	(2)
Greater than 12 months	(27)	(46)
Total	(29)	(48)
Commercial
Fair Value
Less than 12 months	17	19
Greater than 12 months	482	491
Total	499	511
Gross Unrealized Depreciation
Less than 12 months	0	0
Greater than 12 months	(48)	(53)
Total	(49)	(53)
Agency residential
Fair Value
Less than 12 months	594	203
Greater than 12 months	1,017	1,030
Total	1,611	1,233
Gross Unrealized Depreciation
Less than 12 months	(8)	(2)
Greater than 12 months	(143)	(123)
Total	(150)	(124)
Non-agency residential
Fair Value
Less than 12 months	210	125
Greater than 12 months	3	3
Total	213	128
Gross Unrealized Depreciation
Less than 12 months	(4)	(1)
Greater than 12 months	0	0
Total	(4)	(1)
Foreign government securities
Fair Value
Less than 12 months	160	38
Greater than 12 months	445	423
Total	605	461
Gross Unrealized Depreciation
Less than 12 months	(2)	(1)
Greater than 12 months	(46)	(38)
Total	(48)	(39)
Foreign corporate securities
Fair Value
Less than 12 months	288	120
Greater than 12 months	766	821
Total	1,054	940
Gross Unrealized Depreciation
Less than 12 months	(2)	(2)
Greater than 12 months	(82)	(80)
Total	(85)	(82)
Securities where an allowance for credit loss was recorded
Fair Value
Less than 12 months	33	2
Greater than 12 months	2	0
Total	35	2
Gross Unrealized Depreciation
Less than 12 months	(1)	(1)
Greater than 12 months	0	0
Total	$ (1)	$ (1)