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Investments (Schedule Of Available-For-Sale Securities Whose Value Is Below Amortized Cost) (Details) - Fair Value Decline, Greater Than 20% [Member] $ in Millions | Mar. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less than six months | $ 50 | $ 63
Fair Value - Six months or greater, but less than nine months | 52 | 2
Fair Value - Nine months or greater, but less than twelve months | 1 | 23
Fair Value - Twelve months or greater | 27 | 30
Fair Value - Total | 130 | 118
Gross Unrealized Losses - Less than six months | 16 | 23
Gross Unrealized Losses - Six months or greater, but less than nine months | 23 | 1
Gross Unrealized Losses - Nine months or greater, but less than twelve months | 1 | 7
Gross Unrealized Losses - Twelve months or greater | 8 | 11
Gross Unrealized Losses - Total | $ 48 | $ 42
Number of Securities - Less than six months | security | 10 | 14
Number of Securities - Six months or greater, but less than nine months | security | 4 | 4
Number of Securities - Nine months or greater, but less than twelve months | security | 3 | 14
Number of Securities - Twelve months or greater | security | 28 | 20
Number of Securities - Total | security | 45 | 52

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- Definition Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for more than six months, but less than nine. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for more than six months but less than nine, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for less than one year or normal operating cycle, if longer, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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