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Investments (excluding Consolidated Investment Entities) - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 820	$ 702	$ 2,138	$ 2,106
Less: investment expenses	20	15	54	49
Net investment income	800	687	2,084	2,057
Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	618	556	1,785	1,667
Investments in fixed maturities that did not produce net investment income	1		1		$ 1
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	4	3	10	8
Mortgage loans on real estate
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	74	80	221	241
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	11	9	34	32
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	0	3	3	9
Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 113	$ 51	$ 85	$ 149