Segments - Operating Earnings Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Income (loss) attributable to noncontrolling interest	$ 6	$ (1)
Less: Preferred stock dividends	14	10
Total adjustments to income (loss) from continuing operations	44	102
Adjustments
Segment Reporting Information [Line Items]
Net investment gains (losses) and related charges and adjustments	(8)	13
Net guaranteed benefit hedging gains (losses) and related charges and adjustments	(89)	(4)
Income (loss) related to businesses exited or to be exited through reinsurance or divestment	9	9
Income (loss) attributable to noncontrolling interest	6	(1)
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	66
Other adjustments	(22)	(92)
Total adjustments to income (loss) from continuing operations	(90)	1
Operating Segments
Segment Reporting Information [Line Items]
Adjusted operating earnings before income taxes	134	101
Operating Segments \| Retirement
Segment Reporting Information [Line Items]
Adjusted operating earnings before income taxes	124	129
Operating Segments \| Investment Management
Segment Reporting Information [Line Items]
Adjusted operating earnings before income taxes	40	34
Operating Segments \| Employee Benefits
Segment Reporting Information [Line Items]
Adjusted operating earnings before income taxes	61	38
Operating Segments \| Corporate
Segment Reporting Information [Line Items]
Adjusted operating earnings before income taxes	$ (91)	$ (100)

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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