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Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 445	$ 415	$ 857	$ 814
Less: investment expense	17	18	35	35
Net investment income	428	397	822	779
Embedded derivatives - fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	354	341	706	664
Investments in fixed maturities that did not produce net income	1		1		$ 1
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	1	1	3	2
Mortgage loans on real estate
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	55	54	109	107
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	2	3	4	5
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	1	1	2	2
Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 32	$ 15	$ 33	$ 34