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Investments (Schedule Of Other Investments) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | $ 7,945 | $ 6,062
Alternative Investment | 6,770 | 4,921
Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 7,945 | 6,062
Alternative Investment | 6,770 | 4,921
Other [Member] | Other Accounting Method [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 188 | 234
Partially-owned Investment Companies [Member] | Equity Method Investments [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 5,969 | 4,142
Limited Partner [Member] | Cost-method Investments [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 547 | 508
Investment Funds [Member] | Cost-method Investments [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 254 | 271
Life Insurance Product Line [Member] | Other Accounting Method [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 438 | 377
Policy Loans [Member] | Other Accounting Method [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 233 | 247
Non-qualified separate account assets [Member] | Other Accounting Method [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | $ 316 | $ 283

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