FAIR VALUE DISCLOSURES - Fair Value Measurement Reconciliation For All Levels (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), net	$ 4	$ 1	$ 0
Transfers into level 3		5
Level 3 | Corporate
Total gains and (losses), realized and unrealized, included in:
Beginning Balance	14	10	11
Net investment income (loss)	0	0	0
Investment gains (losses), net	0	0	0
Subtotal	0	0	0
Other comprehensive income (loss)	0	0	0
Purchases	1	0	0
Sales	(4)	(1)	(1)
Transfers into level 3	0	5	0
Transfers out of Level 3	0	0	0
Closing Balance	11	14	10
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period.	0	0	0
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period.	0	0	0
Level 3 | States and political subdivisions
Total gains and (losses), realized and unrealized, included in:
Beginning Balance	0	0	1
Net investment income (loss)	0	0	0
Investment gains (losses), net	0	0	0
Subtotal	0	0	0
Other comprehensive income (loss)	0	0	0
Purchases	0	0	0
Sales	0	0	(1)
Transfers into level 3	0	0	0
Transfers out of Level 3	0	0	0
Closing Balance	$ 0	$ 0	$ 0