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Investments (Schedule Of Available-For-Sale Securities Whose Value Is Below Amortized Cost) (Details) $ in Millions | Mar. 31, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Number of Securities - Total | security |  | 895
Fair Value Decline, Greater Than 20% [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less than six months | $ 1,528 | $ 15
Fair Value - Six months or greater, but less than nine months |  | 10
Fair Value - Twelve months or greater | 50 | 132
Fair Value - Total | 1,578 | 157
Gross Unrealized Losses - Less than six months | 803 | 5
Gross Unrealized Losses - Six months or greater, but less than nine months |  | 3
Gross Unrealized Losses - Twelve months or greater | 60 | 76
Gross Unrealized Losses - Total | $ 863 | $ 84
Number of Securities - Less than six months | security | 185 | 7
Number of Securities - Six months or greater, but less than nine months | security |  | 4
Number of Securities - Twelve months or greater | security | 23 | 31
Number of Securities - Total | security | 208 | 42

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