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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, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less than six months | $ 640 | $ 12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 38 | 58
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 678 | 70
Gross Unrealized Losses - Less than six months | 178 | 3
Greater Than Twelve Months | 6 | 8
Fair Value - Total | $ 184 | $ 11
Number of Securities - Less than six months | security | 83 | 6
Number of Securities - Twelve months or greater | security | 21 | 24
Number of Securities - Total | security | 104 | 30

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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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