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Investments (Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Change in unrealized appreciation (depreciation), pre-tax | $ (724) | $ (109) | $ (2,484) | $ (344)
Deferred tax benefit (expense) | 53 | 7 | 285 | 36
Total URA(D) on securities arising during the period | (671) | (101) | (2,199) | (308)
Fixed Maturity Securities and Short-Term Investments [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Change in unrealized appreciation (depreciation), pre-tax | $ (724) | $ (109) | $ (2,484) | $ (344)

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