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Investments - Net Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Investment Income [Line Items]
Investment expenses	$ (77)	$ (71)	$ (59)
Total net investment income	1,780	1,603	1,577
Total fixed maturities
Net Investment Income [Line Items]
Gross investment income	1,459	1,303	1,319
Equity securities
Net Investment Income [Line Items]
Gross investment income	32	24	22
Mortgage loans
Net Investment Income [Line Items]
Gross investment income	141	124	116
Limited partnerships and other alternative investments
Net Investment Income [Line Items]
Gross investment income	205	174	128
Other investments
Net Investment Income [Line Items]
Gross investment income	$ 20	$ 49	$ 51

X

- Definition

Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

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