Investments (Major Categories Of Net Investment Income) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investment Income [Line Items]
Investment income	$ 1,528	$ 1,419	$ 915
Investment expense	(43)	(41)	(38)
Net investment income	1,485	1,378	877
Fixed Maturity Securities [Member]
Investment Income [Line Items]
Investment income	971	755	725
Equity Securities [Member]
Investment Income [Line Items]
Investment income	48	43	71
Cash Equivalents [Member]
Investment Income [Line Items]
Investment income	77	5	28
Other Investments [Member]
Investment Income [Line Items]
Investment income	$ 432	$ 616	$ 91

Amount of expenses related to the generation of investment income.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
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Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Paragraph 2
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-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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