INSURANCE LIABILITIES - Rollforward of Liability and Reinsurance Ceded (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
GMDB Direct
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, beginning of period	$ 5,047	$ 4,665	$ 4,779	$ 4,654
Paid guarantee benefits	(140)	(108)	(251)	(226)
Other changes in reserves	102	153	481	282
Balance, end of period	5,009	4,710	5,009	4,710
GMDB Ceded
Guaranteed Minimum Death Benefit Reinsurance Ceded [Roll Forward]
Balance, beginning of period	(105)	(103)	(98)	(107)
Paid guarantee benefits	4	5	9	9
Other changes in reserves	3	(2)	(9)	(2)
Balance, end of period	(98)	(100)	(98)	(100)
GMIB Direct
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross
Balance, beginning of period	6,297	3,740	4,688	3,741
Paid guarantee benefits	(103)	(56)	(177)	(112)
Other changes in reserves	(43)	75	1,640	130
Balance, end of period	6,151	3,759	6,151	3,759
GMIB Ceded
Guaranteed Minimum Death Benefit Reinsurance Ceded [Roll Forward]
Balance, beginning of period	(3,305)	(2,009)	(2,466)	(1,991)
Paid guarantee benefits	17	14	37	35
Other changes in reserves	(145)	(201)	(1,004)	(240)
Balance, end of period	$ (3,433)	$ (2,196)	$ (3,433)	$ (2,196)