INSURANCE LIABILITIES - Rollforward of Liability and Reinsurance Ceded (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
GMDB Direct
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Opening Balance	$ 5,040	$ 5,086	$ 4,951	$ 5,097
Paid guarantee benefits	(133)	(133)
Other changes in reserve	222	122
Closing Balance	5,040	5,086	4,951	5,097
GMDB Assumed
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Opening Balance	0	72	0	72
Paid guarantee benefits	0	(6)
Other changes in reserve	0	6
Closing Balance	0	72	0	72
GMDB Ceded
Guaranteed Minimum Death Benefit Reinsurance Ceded [Roll Forward]
Opening Balance	(2,216)	(88)
Paid guarantee benefits	56	3
Other changes in reserve	(93)	1
Ending Balance	(2,253)	(84)
GMIB Direct
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Opening Balance	6,024	5,966	5,892	6,026
Paid guarantee benefits	(120)	(92)
Other changes in reserve	252	32
Closing Balance	6,024	5,966	5,892	6,026
GMIB Assumed
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Opening Balance	0	144	0	196
Paid guarantee benefits	0	(52)
Other changes in reserve	0	0
Closing Balance	0	144	$ 0	$ 196
GMIB Ceded
Guaranteed Minimum Death Benefit Reinsurance Ceded [Roll Forward]
Opening Balance	(3,968)	(2,488)
Paid guarantee benefits	15	14
Other changes in reserve	203	567
Ending Balance	$ (3,750)	$ (1,907)