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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, 2025 | Dec. 31, 2024
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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 | $ 9,367 | $ 27,956
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (166) | (518)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 34,783 | 39,789
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3,048) | (4,230)
Debt Securities, Available-for-sale, Unrealized Loss Position | 44,150 | 67,745
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (3,214) | (4,748)
U.S. and local government securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 274 | 767
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2) | (16)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,195 | 2,489
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (222) | (303)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,469 | 3,256
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (224) | (319)
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 | 4,617 | 6,630
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (100) | (138)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 9,797 | 12,023
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (595) | (874)
Debt Securities, Available-for-sale, Unrealized Loss Position | 14,414 | 18,653
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (695) | (1,012)
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 | 3,551 | 10,069
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (57) | (194)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 11,096 | 13,290
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (928) | (1,259)
Debt Securities, Available-for-sale, Unrealized Loss Position | 14,647 | 23,359
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (985) | (1,453)
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 | 925 | 10,490
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (7) | (170)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 11,695 | 11,987
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,303) | (1,794)
Debt Securities, Available-for-sale, Unrealized Loss Position | 12,620 | 22,477
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (1,310) | $ (1,964)

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