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Investments - 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	$ 524	$ 431	$ 1,385	$ 1,288
Less: investment expense	19	18	56	53
Net investment income	505	413	1,329	1,235
Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	415	352	1,186	1,058
Investments in fixed maturities that did not produce net income	1		1		$ 0
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	2	2	6	5
Mortgage loans on real estate
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	50	54	150	163
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	3	0	9	4
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	0	1	1	3
Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 54	$ 22	$ 33	$ 55