Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 225
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Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.

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Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 415	$ 395	$ 814	$ 791
Less: investment expense	18	17	35	34
Net investment income	397	378	779	757
Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	341	325	664	651
Investments in fixed maturities that did not produce net income	1		1		$ 3
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	1	2	2	3
Mortgage loans on real estate
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	54	53	107	104
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	3	3	5	6
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	1	0	2	0
Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 15	$ 12	$ 34	$ 27