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Investments (Schedule Of Available-For-Sale Securities Whose Value Is Below Amortized Cost) (Details) $ in Millions | Sep. 30, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 77,639 | $ 16,786
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 5,744 | 1,973
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 83,383 | 18,759
Less Than or Equal to Twelve Months | 12,693 | 313
Greater Than Twelve Months | 1,687 | 138
Fair Value - Total | $ 14,380 | $ 451
Number of Securities - Total | security | 8,129 | 2,597
Fair Value Decline, Greater Than 20% [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less than six months | $ 19,010 | $ 12
Fair Value - Six months or greater, but less than nine months | 477 |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1 | 58
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 19,489 | 70
Gross Unrealized Losses - Less than six months | 7,186 | 3
Gross Unrealized Losses - Six months or greater, but less than nine months | 326 |
Greater Than Twelve Months |  | 8
Fair Value - Total | $ 7,512 | $ 11
Number of Securities - Less than six months | security | 2,166 | 6
Number of Securities - Six months or greater, but less than nine months | security | 79 |
Number of Securities - Twelve months or greater | security | 13 | 24
Number of Securities - Total | security | 2,260 | 30

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