BUSINESS SEGMENT INFORMATION - Narrative (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	4
Amortization of deferred policy acquisition costs, net	$ 20
Operating earnings excluding SCS-related DAC amortization		$ 4	$ 16	$ 34