Segment Information - Reconciliation of Segment Operating Revenues to Consolidation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 3,275	$ 4,584	$ 6,124	$ 13,002
Change in fair values of derivatives and embedded derivatives – index annuities, net of offsets	1,648	620	959	3,493
Investment gains (losses), net of offsets	1,797	665	773	3,754
Operating Segments | Retirement Services
Segment Reporting Information [Line Items]
Total revenues	1,711	4,096	5,769	9,650
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Total revenues	(15)	28	101	84
Non-operating adjustments
Segment Reporting Information [Line Items]
Change in fair values of derivatives and embedded derivatives – index annuities, net of offsets	637	84	(280)	1,490
Investment gains (losses), net of offsets	468	373	29	1,768
Variable Interest Entity Expense and Noncontrolling Interest	$ (474)	$ (3)	$ (505)	$ (10)