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Investments (excluding Consolidated Investment Entities) - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 602	$ 729	$ 1,318	$ 1,404
Less: investment expenses	16	17	34	34
Net investment income	586	712	1,284	1,370
Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	596	556	1,167	1,111
Investments in fixed maturities that did not produce net investment income	22		22		$ 1
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	3	2	6	5
Mortgage loans on real estate
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	73	82	147	161
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	12	12	23	23
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	1	2	3	6
Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ (83)	$ 75	$ (28)	$ 98