INSURANCE LIABILITIES - Rollforward of Liability and Reinsurance Ceded (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
GMDB Direct
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, beginning of period	$ 4,998	$ 4,709	$ 4,775	$ 4,657
Paid guarantee benefits	(121)	(102)	(372)	(328)
Other changes in reserves	235	155	709	433
Balance, end of period	5,112	4,762	5,112	4,762
GMDB Ceded
Guaranteed Minimum Death Benefit Reinsurance Ceded [Roll Forward]
Balance, beginning of period	(99)	(100)	(99)	(107)
Paid guarantee benefits	3	3	12	11
Other changes in reserves	9	(4)	0	(5)
Balance, end of period	(87)	(101)	(87)	(101)
GMIB Direct
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, beginning of period	6,121	3,757	4,671	3,744
Paid guarantee benefits	(110)	(70)	(287)	(182)
Other changes in reserves	113	979	1,740	1,104
Balance, end of period	6,124	4,666	6,124	4,666
GMIB Ceded
Guaranteed Minimum Death Benefit Reinsurance Ceded [Roll Forward]
Balance, beginning of period	(3,433)	(2,197)	(2,466)	(1,993)
Paid guarantee benefits	21	20	58	55
Other changes in reserves	165	(676)	(839)	(915)
Balance, end of period	$ (3,247)	$ (2,853)	$ (3,247)	$ (2,853)