FAIR VALUE DISCLOSURES - Narrative (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Fair Value Inputs Assets Quantitative Information 1 [Line Items]
Fair value adjustments on GMIB asset	$ 302		$ 175
AFS fixed maturities transferred from Level 3 to Level 2	103	$ 73
AFS fixed maturities transferred from Level 3 to Level 2	$ 219	$ 14
AFS fixed maturities transferred between Level 2 and 3 (percentage)	2.10%	0.60%
Level 3 | Fair Value, Nonrecurring
Fair Value Inputs Assets Quantitative Information 1 [Line Items]
Fair value measurements not included in quantitative information about level 3 fair value measurements	$ 409		$ 325