Investments - Net Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income, Operating	$ 1,695	$ 1,588	$ 1,563
Less: investment expense	72	68	62
Net investment income	1,623	1,520	1,501
Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income, Operating	1,363	1,302	1,325
Financing Receivable, Recorded Investment, Nonaccrual Status	1	3
Equity securities, available-for-sale
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income, Operating	5	4	4
Mortgage loans on real estate
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income, Operating	220	211	191
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income, Operating	9	10	12
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income, Operating	3	1	1
Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross Investment Income, Operating	$ 95	$ 60	$ 30

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

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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