BUSINESS SEGMENT INFORMATION - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 12,593	$ 1,714
Operating Segments \| Individual Retirement
Segment Reporting Information [Line Items]
Total revenues	1,481	1,007
Operating Segments \| Group Retirement
Segment Reporting Information [Line Items]
Total revenues	282	251
Operating Segments \| Investment Management and Research
Segment Reporting Information [Line Items]
Total revenues	907	780
Operating Segments \| Protection Solutions
Segment Reporting Information [Line Items]
Total revenues	859	831
Corporate and Other
Segment Reporting Information [Line Items]
Total revenues	299	312
Adjustments
Adjustments related to:
Variable annuity product features	8,339	(1,478)
Investment (gains) losses	(4)	11
Other adjustments to segment revenues	422	22
Assumption updates due to COVID-19	46
Other COVID-19 related impact	(51)
Intersegment Eliminations
Adjustments related to:
Investment expenses	18	18
Investment management and other fees \| Intersegment Eliminations
Adjustments related to:
Revenues	$ 27	$ 25

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