INVESTMENTS - Schedule of Aggregate Fair Value and Gross Unrealized Depreciation of Fixed Maturity Securities by Security Type (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair Value
Less than 12 months	$ 5,267	$ 2,566
Greater than 12 months	11,143	12,222
Total	16,409	14,789
Gross Unrealized Depreciation
Less than 12 months	(116)	(102)
Greater than 12 months	(1,092)	(1,035)
Total	(1,209)	(1,137)
No Recorded Allowance for Credit Losses
Fair Value
Less than 12 months	5,233	2,564
Greater than 12 months	11,141	12,222
Total	16,374	14,787
Gross Unrealized Depreciation
Less than 12 months	(115)	(101)
Greater than 12 months	(1,092)	(1,035)
Total	(1,208)	(1,136)
U.S. Treasury securities and obligations of U.S. government agencies and corporations
Fair Value
Less than 12 months	159	122
Greater than 12 months	749	772
Total	908	893
Gross Unrealized Depreciation
Less than 12 months	(3)	(3)
Greater than 12 months	(49)	(49)
Total	(52)	(52)
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	1,767	1,019
Greater than 12 months	2,911	2,780
Total	4,678	3,799
Gross Unrealized Depreciation
Less than 12 months	(47)	(58)
Greater than 12 months	(282)	(263)
Total	(329)	(321)
Asset-backed Securities
Fair Value
Less than 12 months	399	196
Greater than 12 months	943	2,014
Total	1,342	2,210
Gross Unrealized Depreciation
Less than 12 months	(3)	(2)
Greater than 12 months	(30)	(49)
Total	(33)	(51)
Commercial
Fair Value
Less than 12 months	167	181
Greater than 12 months	722	742
Total	890	923
Gross Unrealized Depreciation
Less than 12 months	(17)	(19)
Greater than 12 months	(66)	(73)
Total	(84)	(92)
Agency Residential
Fair Value
Less than 12 months	1,143	423
Greater than 12 months	2,101	2,126
Total	3,244	2,549
Gross Unrealized Depreciation
Less than 12 months	(18)	(4)
Greater than 12 months	(262)	(225)
Total	(280)	(229)
Non-agency Residential
Fair Value
Less than 12 months	211	126
Greater than 12 months	5	4
Total	215	130
Gross Unrealized Depreciation
Less than 12 months	(4)	(1)
Greater than 12 months	0	0
Total	(4)	0
Foreign government securities
Fair Value
Less than 12 months	494	172
Greater than 12 months	994	985
Total	1,488	1,156
Gross Unrealized Depreciation
Less than 12 months	(14)	(7)
Greater than 12 months	(117)	(101)
Total	(131)	(108)
Foreign corporate securities
Fair Value
Less than 12 months	885	324
Greater than 12 months	2,653	2,726
Total	3,537	3,050
Gross Unrealized Depreciation
Less than 12 months	(9)	(6)
Greater than 12 months	(276)	(265)
Total	(285)	(271)
Recorded an Allowance for Credit Losses
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)

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