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Investments (excluding Consolidated Investment Entities) - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 716	$ 675
Less: investment expenses	18	17
Net investment income	698	658
Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	571	555
Investments in fixed maturities that did not produce net investment income	5		$ 1
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	3	3
Mortgage loans on real estate
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	74	79
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	11	11
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	2	4
Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 55	$ 23