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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 | Sep. 30, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less than six months | $ 9 | $ 63
Fair Value - Six months or greater, but less than nine months | 17 | 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 23
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 60 | 30
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 86 | 118
Gross Unrealized Losses - Less than six months | 2 | 23
Gross Unrealized Losses - Six months or greater, but less than nine months | 5 | 1
Less Than or Equal to Twelve Months |  | 7
Greater Than Twelve Months | 9 | 11
Fair Value - Total | $ 16 | $ 42
Number of Securities - Less than six months | security | 4 | 14
Number of Securities - Six months or greater, but less than nine months | security | 1 | 4
Number of Securities - Nine months or greater, but less than twelve months | security |  | 14
Number of Securities - Twelve months or greater | security | 25 | 20
Number of Securities - Total | security | 30 | 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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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