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Investments (Schedule Of Available-For-Sale Securities Whose Value Is Below Amortized Cost) (Details) $ in Millions | Jun. 30, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
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Schedule of Available-for-sale Securities [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 27,262 | $ 71,770
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 55,728 | 11,352
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 82,990 | 83,122
Less Than or Equal to Twelve Months | 1,505 | 10,425
Greater Than Twelve Months | 10,135 | 2,593
Continuous Unrealized Loss Position, Total | $ 11,640 | $ 13,018
Number of Securities - Total | security | 8,331 | 8,175
Fair Value Decline, Greater Than 20% [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less than six months | $ 4,669 | $ 11,351
Fair Value - Six months or greater, but less than nine months | 208 | 4,411
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 4,214 | 447
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4,687 | 2
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 13,778 | 16,211
Gross Unrealized Losses - Less than six months | 1,324 | 3,659
Gross Unrealized Losses - Six months or greater, but less than nine months | 85 | 2,226
Less Than or Equal to Twelve Months | 1,588 | 302
Greater Than Twelve Months | 2,355 | 1
Continuous Unrealized Loss Position, Total | $ 5,352 | $ 6,188
Number of Securities - Less than six months | security | 674 | 1,500
Number of Securities - Six months or greater, but less than nine months | security | 34 | 650
Number of Securities - Nine months or greater, but less than twelve months | security | 697 | 74
Number of Securities - Twelve months or greater | security | 666 | 15
Number of Securities - Total | security | 2,071 | 2,239

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