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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 | Jun. 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 | $ 12,792 | $ 27,956
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (201) | (518)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 36,192 | 39,789
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3,273) | (4,230)
Debt Securities, Available-for-sale, Unrealized Loss Position | 48,984 | 67,745
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (3,474) | (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 | 528 | 767
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (7) | (16)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,386 | 2,489
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (248) | (303)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,914 | 3,256
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (255) | (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 | 3,265 | 6,630
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (65) | (138)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 10,654 | 12,023
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (668) | (874)
Debt Securities, Available-for-sale, Unrealized Loss Position | 13,919 | 18,653
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (733) | (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 | 4,608 | 10,069
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (90) | (194)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 11,476 | 13,290
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (867) | (1,259)
Debt Securities, Available-for-sale, Unrealized Loss Position | 16,084 | 23,359
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (957) | (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 | 4,391 | 10,490
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (39) | (170)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 11,676 | 11,987
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,490) | (1,794)
Debt Securities, Available-for-sale, Unrealized Loss Position | 16,067 | 22,477
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (1,529) | $ (1,964)

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