BUSINESS SEGMENT INFORMATION - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total revenues	$ (2,530)	$ 3,160	$ 10,063	$ 4,874
Operating Segments | Individual Retirement
Segment Reporting Information [Line Items]
Total revenues	809	1,073	2,290	2,080
Operating Segments | Group Retirement
Segment Reporting Information [Line Items]
Total revenues	246	267	528	518
Operating Segments | Investment Management and Research
Segment Reporting Information [Line Items]
Total revenues	844	848	1,751	1,628
Operating Segments | Protection Solutions
Segment Reporting Information [Line Items]
Total revenues	730	843	1,589	1,674
Corporate and Other
Segment Reporting Information [Line Items]
Total revenues	283	300	582	612
Adjustments
Adjustments related to:
Variable annuity product features	(5,678)	(161)	2,661	(1,639)
Investment (gains) losses	169	(12)	173	(23)
Other adjustments to segment revenues	67	2	489	24
Assumption updates due to COVID-19			46
Other COVID-19 related impact	21		(30)
Intersegment Eliminations
Adjustments related to:
Investment expenses	17	21	35	39
Investment management and other fees | Intersegment Eliminations
Adjustments related to:
Revenues	$ 27	$ 26	$ 54	$ 51