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Investments (Schedule Of Other Investments) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | $ 6,062 | $ 5,277
Alternative Investment | 4,921 | 4,244
Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 6,062 | 5,277
Alternative Investment | 4,921 | 4,244
Other [Member] | Other Accounting Method [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 234 | 234
Partially-owned Investment Companies [Member] | Equity Method Investments [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 4,142 | 3,623
Limited Partner [Member] | Cost-method Investments [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 508 | 538
Investment Funds [Member] | Cost-method Investments [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 271 | 83
Life Insurance Product Line [Member] | Other Accounting Method [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 377 | 304
Policy Loans [Member] | Other Accounting Method [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 247 | 243
Non-qualified separate account assets [Member] | Other Accounting Method [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | $ 283 | $ 252

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