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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 | Dec. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less than six months | $ 11,351 | $ 12
Fair Value - Six months or greater, but less than nine months | 4,411 |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 447 |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2 | 58
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 16,211 | 70
Gross Unrealized Losses - Less than six months | 3,659 | 3
Gross Unrealized Losses - Six months or greater, but less than nine months | 2,226 |
Less Than or Equal to Twelve Months | 302 |
Greater Than Twelve Months | 1 | 8
Fair Value - Total | $ 6,188 | $ 11
Number of Securities - Less than six months | security | 1,500 | 6
Number of Securities - Six months or greater, but less than nine months | security | 650 |
Number of Securities - Nine months or greater, but less than twelve months | security | 74 |
Number of Securities - Twelve months or greater | security | 15 | 24
Number of Securities - Total | security | 2,239 | 30

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