INVESTMENTS - Summary of Aggregate Market Value and Gross Unrealized Depreciation of Fixed Maturity and Equity Securities, by Security Type (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Fair Value
Less than 12 months	$ 3,093	$ 8,524
Greater than 12 months	8,406	2,698
Total	11,499	11,222
Gross Unrealized Depreciation
Less than 12 months	(127)	(591)
Greater than 12 months	(792)	(421)
Total	(919)	(1,013)
No Recorded Allowance for Credit Losses
Fair Value
Less than 12 months	3,092	8,522
Greater than 12 months	8,406	2,698
Total	11,498	11,220
Gross Unrealized Depreciation
Less than 12 months	(126)	(591)
Greater than 12 months	(792)	(421)
Total	(918)	(1,012)
U.S. Treasury securities and obligations of U.S. government agencies and corporations
Fair Value
Less than 12 months	30	290
Greater than 12 months	408	245
Total	438	535
Gross Unrealized Depreciation
Less than 12 months	(1)	(14)
Greater than 12 months	(36)	(26)
Total	(37)	(40)
Obligations of U.S. states and political subdivisions
Fair Value
Less than 12 months	77	235
Greater than 12 months	199	27
Total	276	261
Gross Unrealized Depreciation
Less than 12 months	(1)	(23)
Greater than 12 months	(29)	(9)
Total	(30)	(32)
Corporate Securities
Fair Value
Less than 12 months	1,135	2,138
Greater than 12 months	2,128	841
Total	3,263	2,979
Gross Unrealized Depreciation
Less than 12 months	(84)	(175)
Greater than 12 months	(224)	(146)
Total	(308)	(321)
Asset Backed Securities
Fair Value
Less than 12 months	1,058	3,120
Greater than 12 months	2,426	436
Total	3,484	3,556
Gross Unrealized Depreciation
Less than 12 months	(23)	(138)
Greater than 12 months	(88)	(27)
Total	(111)	(165)
Commercial
Fair Value
Less than 12 months	17	464
Greater than 12 months	480	36
Total	497	500
Gross Unrealized Depreciation
Less than 12 months	(1)	(50)
Greater than 12 months	(62)	(9)
Total	(63)	(59)
Agency residential
Fair Value
Less than 12 months	319	852
Greater than 12 months	1,166	605
Total	1,485	1,456
Gross Unrealized Depreciation
Less than 12 months	(5)	(54)
Greater than 12 months	(160)	(113)
Total	(166)	(167)
Non-agency residential
Fair Value
Less than 12 months	57	2
Greater than 12 months	3	1
Total	59	3
Gross Unrealized Depreciation
Less than 12 months	(1)	0
Greater than 12 months	0	0
Total	(1)	0
Foreign government securities
Fair Value
Less than 12 months	108	455
Greater than 12 months	484	144
Total	591	599
Gross Unrealized Depreciation
Less than 12 months	(2)	(36)
Greater than 12 months	(51)	(25)
Total	(53)	(61)
Foreign Corporate
Fair Value
Less than 12 months	293	967
Greater than 12 months	1,112	365
Total	1,405	1,332
Gross Unrealized Depreciation
Less than 12 months	(9)	(100)
Greater than 12 months	(140)	(67)
Total	(149)	(167)
Securities where an allowance for credit loss was recorded
Fair Value
Less than 12 months	0	2
Greater than 12 months	0	0
Total	1	2
Gross Unrealized Depreciation
Less than 12 months	0	(1)
Greater than 12 months	(1)	0
Total	$ (1)	$ (1)