BUSINESS SEGMENT INFORMATION - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total assets	$ 277,658	$ 292,262
Operating Segments | Individual Retirement
Segment Reporting Information [Line Items]
Total assets	132,467	143,663
Operating Segments | Group Retirement
Segment Reporting Information [Line Items]
Total assets	53,531	55,368
Operating Segments | Investment Management and Research
Segment Reporting Information [Line Items]
Total assets	12,010	11,602
Operating Segments | Protection Solutions
Segment Reporting Information [Line Items]
Total assets	43,504	50,686
Corporate and Other
Segment Reporting Information [Line Items]
Total assets	$ 36,146	$ 30,943