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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 | Sep. 30, 2024 | Dec. 31, 2023
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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 | $ 3,916 | $ 8,569
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (45) | (176)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 45,457 | 53,950
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3,271) | (4,129)
Debt Securities, Available-for-sale, Unrealized Loss Position | 49,373 | 62,519
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (3,316) | (4,305)
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 | 0 | 463
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (9)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,677 | 2,504
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (98) | (135)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,677 | 2,967
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (98) | (144)
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 | 1,706 | 2,464
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (26) | (43)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 13,628 | 15,971
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (734) | (957)
Debt Securities, Available-for-sale, Unrealized Loss Position | 15,334 | 18,435
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (760) | (1,000)
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 | 1,511 | 2,866
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (13) | (51)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 15,280 | 20,334
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (959) | (1,194)
Debt Securities, Available-for-sale, Unrealized Loss Position | 16,791 | 23,200
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (972) | (1,245)
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 | 664 | 1,659
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (5) | (58)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 13,684 | 13,831
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,366) | (1,706)
Debt Securities, Available-for-sale, Unrealized Loss Position | 14,348 | 15,490
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,371) | (1,764)
Municipal |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 35 | 1,117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1) | (15)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,188 | 1,310
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (114) | (137)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,223 | 2,427
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (115) | $ (152)

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