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Investments (Schedule Of Other Investments) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | $ 5,277 | $ 4,672
Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 5,277 | 4,672
Cost |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 5,277 | 4,417
Other [Member] | Other Accounting Method [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 234 | 168
Other [Member] | Other Accounting Method [Member] | Cost |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 234 | 168
Partially-owned Investment Companies [Member] | Equity Method Investments [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 3,623 | 2,803
Partially-owned Investment Companies [Member] | Equity Method Investments [Member] | Cost |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 3,623 | 2,803
Limited Partner [Member] | Cost-method Investments [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 538 | 549
Limited Partner [Member] | Cost-method Investments [Member] | Cost |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 538 | 441
Investment Funds [Member] | Cost-method Investments [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 83 | 270
Investment Funds [Member] | Cost-method Investments [Member] | Cost |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 83 | 123
Life Insurance Product Line [Member] | Other Accounting Method [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 304 | 305
Life Insurance Product Line [Member] | Other Accounting Method [Member] | Cost |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 304 | 305
Policy Loans [Member] | Other Accounting Method [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 243 | 244
Policy Loans [Member] | Other Accounting Method [Member] | Cost |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 243 | 244
Non-qualified separate account assets [Member] | Other Accounting Method [Member] | Fair Value |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | 252 | 333
Non-qualified separate account assets [Member] | Other Accounting Method [Member] | Cost |  |
Other Investment Not Readily Marketable [Line Items] |  |
Other Investments | $ 252 | $ 333

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