INVESTMENTS - Net Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Investment Income [Line Items]
Equity in income (loss) from AB	$ 3	$ 8	$ 7
Gross investment income (loss)	93	86	74
Investment expenses	(3)	(3)	(3)
Net investment income (loss)	90	83	71
Alliance Bernstein
Net Investment Income [Line Items]
Equity in income (loss) from AB	3	8	7
Fixed maturities
Net Investment Income [Line Items]
Investment income	83	74	61
Mortgage loans on real estate
Net Investment Income [Line Items]
Investment income	1	1	1
Other equity investments
Net Investment Income [Line Items]
Investment income	3	0	0
Policy loans
Net Investment Income [Line Items]
Investment income	3	3	3
Other
Net Investment Income [Line Items]
Investment income	$ 0	$ 0	$ 2

Other investment income

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