INVESTMENTS - Available-for-sale Securities (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 11,551		$ 10,050
Allowance for Credit Losses	0		0
Gross Unrealized Gains	105		145
Gross Unrealized Losses	350		304
Fair Value	11,306		9,891
Amortized Cost (Less Allowance for Credit Losses)
Due in one year or less	123
Due in years two through five	1,599
Due in years six through ten	3,260
Due after ten years	1,414
Subtotal	6,396
Amortized Cost	11,551
Fair Value
Due in one year or less	123
Due in years two through five	1,587
Due in years six through ten	3,199
Due after ten years	1,221
Subtotal	6,130
Fair Value	11,306		9,891
Available-For-Sale Fixed Maturities Proceeds, Gross Gains (Losses) From Sales And Other Than Temporary Impairments [Abstract]
Proceeds from sales	0	$ 50
Gross gains on sales	0	0
Gross losses on sales	0	(5)
Fixed Maturities - Credit Loss Impairments
Balance, beginning of period	0	0
Previously recognized impairments on securities that matured, paid, prepaid or sold	0	0
Balance, end of period	0	$ 0
Corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,281		5,842
Allowance for Credit Losses	0		0
Gross Unrealized Gains	60		96
Gross Unrealized Losses	317		276
Fair Value	6,024		5,662
Fair Value
Fair Value	6,024		5,662
U.S. Treasury, government and agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15		15
Allowance for Credit Losses	0		0
Gross Unrealized Gains	0		0
Gross Unrealized Losses	1		0
Fair Value	14		15
Fair Value
Fair Value	14		15
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	51		50
Allowance for Credit Losses	0		0
Gross Unrealized Gains	0		0
Gross Unrealized Losses	8		7
Fair Value	43		43
Fair Value
Fair Value	43		43
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	49		31
Allowance for Credit Losses	0		0
Gross Unrealized Gains	1		1
Gross Unrealized Losses	1		1
Fair Value	49		31
Fair Value
Fair Value	49		31
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,112		961
Allowance for Credit Losses	0		0
Gross Unrealized Gains	8		15
Gross Unrealized Losses	8		4
Fair Value	1,112		972
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	1,112
Fair Value
Without single maturity date	1,112
Fair Value	1,112		972
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,778		2,956
Allowance for Credit Losses	0		0
Gross Unrealized Gains	34		32
Gross Unrealized Losses	3		2
Fair Value	3,809		2,986
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	3,778
Fair Value
Without single maturity date	3,809
Fair Value	3,809		2,986
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	265		195
Allowance for Credit Losses	0		0
Gross Unrealized Gains	2		1
Gross Unrealized Losses	12		14
Fair Value	255		182
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	265
Fair Value
Without single maturity date	255
Fair Value	$ 255		$ 182

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