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INVESTMENTS - Summary of Fixed Maturity Securities (Details) - USD ($) $ in Millions	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Fixed maturity securities - available for sale
Amortized Cost	$ 26,372		$ 24,191
Allowance for Credit Losses	(63)	$ (62)	(54)	$ (43)	$ (42)	$ (30)
Unrealized Appreciation	63		81
Unrealized Depreciation	(1,883)		(1,982)
Fair Value	24,489		22,236
Fixed maturity securities - held to maturity
Amortized Cost	806		848
Allowance for Credit Losses	(8)	(9)	(9)
Unrealized Appreciation	4		3
Unrealized Depreciation	(21)		(22)
Fair Value	781		821
U.S. Treasury securities and obligations of U.S. government agencies and corporations
Fixed maturity securities - available for sale
Amortized Cost	1,225		1,334
Allowance for Credit Losses	0		0
Unrealized Appreciation	2		6
Unrealized Depreciation	(82)		(82)
Fair Value	1,145		1,257
Obligations of U.S. states and political subdivisions
Fixed maturity securities - available for sale
Amortized Cost	424		444
Allowance for Credit Losses	0		0
Unrealized Appreciation	1		2
Unrealized Depreciation	(30)		(32)
Fair Value	395		413
Corporate Securities
Fixed maturity securities - available for sale
Amortized Cost	7,639		7,044
Allowance for Credit Losses	(56)	(55)	(45)	(26)	(20)	(19)
Unrealized Appreciation	27		31
Unrealized Depreciation	(553)		(561)
Fair Value	7,057		6,469
Fixed maturity securities - held to maturity
Amortized Cost	152		152
Allowance for Credit Losses	(2)	(2)	(2)
Unrealized Appreciation	0		0
Unrealized Depreciation	(6)		(6)
Fair Value	144		144
Asset-backed Securities
Fixed maturity securities - available for sale
Amortized Cost	4,973		4,229
Allowance for Credit Losses	0	0	0	0	(8)	(8)
Unrealized Appreciation	6		5
Unrealized Depreciation	(117)		(171)
Fair Value	4,862		4,063
Fixed maturity securities - held to maturity
Amortized Cost	612		661
Allowance for Credit Losses	(5)	(6)	(6)
Unrealized Appreciation	2		2
Unrealized Depreciation	(15)		(15)
Fair Value	595		642
Commercial
Fixed maturity securities - available for sale
Amortized Cost	1,085		1,023
Allowance for Credit Losses	0		0
Unrealized Appreciation	0		0
Unrealized Depreciation	(113)		(105)
Fair Value	972		919
Fixed maturity securities - held to maturity
Amortized Cost	14		7
Allowance for Credit Losses	0		0
Unrealized Appreciation	0		0
Unrealized Depreciation	0		0
Fair Value	14		7
Agency Residential
Fixed maturity securities - available for sale
Amortized Cost	3,673		3,382
Allowance for Credit Losses	0		0
Unrealized Appreciation	6		7
Unrealized Depreciation	(292)		(290)
Fair Value	3,387		3,099
Non-agency Residential
Fixed maturity securities - available for sale
Amortized Cost	62		5
Allowance for Credit Losses	0		0
Unrealized Appreciation	0		0
Unrealized Depreciation	(1)		(1)
Fair Value	61		4
Foreign government securities
Fixed maturity securities - available for sale
Amortized Cost	1,755		1,586
Allowance for Credit Losses	0		0
Unrealized Appreciation	7		8
Unrealized Depreciation	(165)		(179)
Fair Value	1,597		1,415
Foreign corporate securities
Fixed maturity securities - available for sale
Amortized Cost	5,536		5,143
Allowance for Credit Losses	(7)	(7)	(10)	$ (17)	$ (14)	$ (3)
Unrealized Appreciation	14		23
Unrealized Depreciation	(530)		(562)
Fair Value	5,013		4,596
Fixed maturity securities - held to maturity
Amortized Cost	28		28
Allowance for Credit Losses	(1)	$ (1)	(1)
Unrealized Appreciation	2		2
Unrealized Depreciation	0		0
Fair Value	$ 29		$ 28

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