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Investments (Schedule Of Available-For-Sale Securities Whose Value Is Below Amortized Cost) (Details) $ in Millions | Jun. 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 | $ 70,723 | $ 16,786
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4,711 | 1,973
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 75,434 | 18,759
Less Than or Equal to Twelve Months | 7,452 | 313
Greater Than Twelve Months | 1,100 | 138
Fair Value - Total | $ 8,552 | $ 451
Number of Securities - Total | security | 7,122 | 2,597
Fair Value Decline, Greater Than 20% [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less than six months | $ 8,166 | $ 12
Fair Value - Six months or greater, but less than nine months | 4 |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1 | 58
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 8,171 | 70
Gross Unrealized Losses - Less than six months | 2,797 | 3
Gross Unrealized Losses - Six months or greater, but less than nine months | 1 |
Greater Than Twelve Months | 1 | 8
Fair Value - Total | $ 2,799 | $ 11
Number of Securities - Less than six months | security | 1,040 | 6
Number of Securities - Six months or greater, but less than nine months | security | 3 |
Number of Securities - Twelve months or greater | security | 17 | 24
Number of Securities - Total | security | 1,060 | 30

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