Segments - Operating Earnings Before Income Taxes (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]
Income (loss) attributable to noncontrolling interest	$ (79)	$ 26	$ (73)	$ 25
Less: Preferred stock dividends	4	0	18	10
Total adjustments to income (loss) from continuing operations	(48)	243	(4)	345
Adjustments
Segment Reporting Information [Line Items]
Net investment gains (losses) and related charges and adjustments	42	45	34	58
Net guaranteed benefit hedging gains (losses) and related charges and adjustments	38	(6)	(52)	(10)
Income (loss) related to businesses exited or to be exited through reinsurance or divestment	(55)	40	(45)	49
Income (loss) attributable to noncontrolling interest	(79)	26	(73)	25
Income (loss) related to early extinguishment of debt			0	0
Immediate recognition of net actuarial gains (losses) related to pension and other post-employment benefit obligations and gains (losses) from plan amendments and curtailments	0	0	0	66
Other adjustments	(15)	(52)	(37)	(144)
Total adjustments to income (loss) from continuing operations	(65)	53	(155)	54
Operating Segments
Segment Reporting Information [Line Items]
Adjusted operating earnings before income taxes	17	190	151	291
Operating Segments \| Retirement
Segment Reporting Information [Line Items]
Adjusted operating earnings before income taxes	37	180	160	309
Operating Segments \| Investment Management
Segment Reporting Information [Line Items]
Adjusted operating earnings before income taxes	20	41	59	75
Operating Segments \| Employee Benefits
Segment Reporting Information [Line Items]
Adjusted operating earnings before income taxes	36	49	98	87
Operating Segments \| Corporate
Segment Reporting Information [Line Items]
Adjusted operating earnings before income taxes	$ (75)	$ (80)	$ (166)	$ (180)

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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