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Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 826	$ 677	$ 2,447	$ 1,960
Investment expense	(30)	(23)	(80)	(67)
Investment income, net of related expenses	796	654	2,367	1,893
Available-for-sale Securities [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	519	483	1,530	1,437
Equity securities
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	1	2	4	5
Mortgage Loans on Real Estate [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	81	66	220	199
Policy loans
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	14	13	41	42
Funds withheld at interest
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	100	95	279	217
Short-term Investments [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	1	1	2	7
Other invested assets
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 110	$ 17	$ 371	$ 53

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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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
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Amount of expenses related to the generation of investment income.

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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.

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