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Investments - 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	$ 403	$ 445	$ 861	$ 857
Less: investment expense	18	17	37	35
Net investment income	385	428	824	822
Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	398	354	771	706
Investments in fixed maturities that did not produce net income	12		12		$ 0
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	2	1	4	3
Mortgage loans on real estate
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	50	55	100	109
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	4	2	6	4
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	0	1	1	2
Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ (51)	$ 32	$ (21)	$ 33