INVESTMENTS - Available-for-sale Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, amortized cost	$ 2,528		$ 2,444
Fixed maturities, allowance for credit losses	0		0
Fixed maturities, gross unrealized gains	20		139
Fixed maturities, gross unrealized losses	113		11
Fair Value	2,435		2,572
Amortized Cost
Due in one year or less	40
Due in years two through five	599
Due in years six through ten	844
Due after ten years	934
Subtotal	2,417
Amortized Cost	2,528
Fair Value
Due in one year or less	40
Due in years two through five	604
Due in years six through ten	818
Due after ten years	870
Subtotal	2,332
Fair Value	2,435		2,572
Available For Sale Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments [Abstract]
Proceeds from sales	23	$ 18
Gross gains on sales	0	0
Gross losses on sales	1	0
Credit losses	0	0
Fixed Maturities - Credit Loss Impairments
Balance, beginning of period	2	2
Previously recognized impairments on securities that matured, paid, prepaid or sold	0	0
Recognized impairments on securities impaired to fair value this period	0	0
Credit losses recognized this period on securities for which credit losses were not previously recognized	0	0
Additional credit losses this period on securities previously impaired	0	0
Increases due to passage of time on previously recorded credit losses	0	0
Accretion of previously recognized impairments due to increases in expected cash flows (for OTTI securities 2019 and prior)	0	0
Balance, end of period	2	$ 2
Corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, amortized cost	2,330		2,237
Fixed maturities, allowance for credit losses	0		0
Fixed maturities, gross unrealized gains	20		135
Fixed maturities, gross unrealized losses	101		10
Fair Value	2,249		2,362
Fair Value
Fair Value	2,249		2,362
U.S. Treasury, government and agency
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, amortized cost	51		66
Fixed maturities, allowance for credit losses	0		0
Fixed maturities, gross unrealized gains	0		1
Fixed maturities, gross unrealized losses	2		1
Fair Value	49		66
Fair Value
Fair Value	49		66
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, amortized cost	35		31
Fixed maturities, allowance for credit losses	0		0
Fixed maturities, gross unrealized gains	0		3
Fixed maturities, gross unrealized losses	2		0
Fair Value	33		34
Fair Value
Fair Value	33		34
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, amortized cost	1
Fixed maturities, allowance for credit losses	0
Fixed maturities, gross unrealized gains	0
Fixed maturities, gross unrealized losses	0
Fair Value	1
Fair Value
Fair Value	1
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, amortized cost	31		30
Fixed maturities, allowance for credit losses	0		0
Fixed maturities, gross unrealized gains	0		0
Fixed maturities, gross unrealized losses	1		0
Fair Value	30		30
Amortized Cost
Without single maturity date	31
Fair Value
Without single maturity date	30
Fair Value	30		30
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, amortized cost	80		80
Fixed maturities, allowance for credit losses	0		0
Fixed maturities, gross unrealized gains	0		0
Fixed maturities, gross unrealized losses	7		0
Fair Value	73		80
Amortized Cost
Without single maturity date	80
Fair Value
Without single maturity date	73
Fair Value	$ 73		$ 80