Investments (Schedule Of Other Investments) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Other Investment Not Readily Marketable [Line Items]
Other Investments	$ 11,169	$ 7,945
Alternative Investment	10,108	6,770
Fair Value
Other Investment Not Readily Marketable [Line Items]
Other Investments	11,169	7,945
Alternative Investment	10,108	6,770
Other [Member] | Other Accounting Method [Member] | Fair Value
Other Investment Not Readily Marketable [Line Items]
Other Investments	59	188
Partially-owned Investment Companies [Member] | Equity Method Investments [Member] | Fair Value
Other Investment Not Readily Marketable [Line Items]
Other Investments	9,210	5,969
Limited Partner [Member] | Cost-method Investments [Member] | Fair Value
Other Investment Not Readily Marketable [Line Items]
Other Investments	631	547
Investment Funds [Member] | Cost-method Investments [Member] | Fair Value
Other Investment Not Readily Marketable [Line Items]
Other Investments	267	254
Life [Member] | Other Accounting Method [Member] | Fair Value
Other Investment Not Readily Marketable [Line Items]
Other Investments	481	438
Policy Loans [Member] | Other Accounting Method [Member] | Fair Value
Other Investment Not Readily Marketable [Line Items]
Other Investments	243	233
Non-qualified separate account assets [Member] | Other Accounting Method [Member] | Fair Value
Other Investment Not Readily Marketable [Line Items]
Other Investments	$ 278	$ 316