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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-Name Accounting Standards Codification
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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 445	$ 396	$ 1,259	$ 1,187
Less: investment expense	20	17	55	51
Net investment income	425	379	1,204	1,136
Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	347	324	1,011	975
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	2	1	4	4
Mortgage loans on real estate
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	57	53	164	157
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	2	2	7	8
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	0	0	2	0
Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 37	$ 16	$ 71	$ 43