Segment Information - Reconciliation of Segment Operating Revenues to Consolidation (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	$ 4,398	$ 3,423	$ 2,849	$ 8,418
Change in fair values of derivatives and embedded derivatives – index annuities, net of offsets	2,330	1,181	(689)	2,873
Investment gains (losses), net of offsets	2,548	1,313	(1,024)	3,089
Operating Segments | Retirement Services
Segment Reporting Information [Line Items]
Total revenues	1,589	2,248	4,058	5,554
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Total revenues			116
Non-operating adjustments
Segment Reporting Information [Line Items]
Change in fair values of derivatives and embedded derivatives – index annuities, net of offsets	754	466	(917)	1,406
Investment gains (losses), net of offsets	1,246	682	(439)	1,395
Variable Interest Entity Expense and Noncontrolling Interest	$ (363)	$ (3)	$ (31)	$ (7)