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Investments - 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	$ 458	$ 412
Less: investment expense	19	18
Net investment income	439	394
Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	373	352
Investments in fixed maturities that did not produce net income	2		$ 0
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	2	2
Mortgage loans on real estate
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	50	54
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	2	2
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	1	1
Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 30	$ 1