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Investments (Aggregate Fair Value And Gross Unrealized Loss By Length Of Time Security Has Continuously Been In Unrealized Loss Position) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 8,569 | $ 57,189
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (176) | (4,115)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 53,950 | 14,991
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (4,129) | (2,291)
Debt Securities, Available-for-sale, Unrealized Loss Position | 62,519 | 72,180
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (4,305) | (6,406)
U.S. Treasury / Agency |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 463 | 2,152
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (9) | (125)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,504 | 386
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (135) | (46)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,967 | 2,538
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (144) | (171)
Non-U.S. |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,464 | 15,538
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (43) | (1,012)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 15,971 | 5,490
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (957) | (704)
Debt Securities, Available-for-sale, Unrealized Loss Position | 18,435 | 21,028
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,000) | (1,716)
Corporate and asset-backed securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,866 | 25,687
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (51) | (1,793)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 20,334 | 4,190
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,194) | (552)
Debt Securities, Available-for-sale, Unrealized Loss Position | 23,200 | 29,877
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,245) | (2,345)
Mortgage-backed securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,659 | 10,561
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (58) | (1,033)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 13,831 | 4,770
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,706) | (941)
Debt Securities, Available-for-sale, Unrealized Loss Position | 15,490 | 15,331
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,764) | (1,974)
Municipal |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,117 | 3,251
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (15) | (152)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,310 | 155
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (137) | (48)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,427 | 3,406
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (152) | $ (200)

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