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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, 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 | $ 17,393 | $ 8,569
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (226) | (176)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 52,606 | 53,950
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (4,895) | (4,129)
Debt Securities, Available-for-sale, Unrealized Loss Position | 69,999 | 62,519
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (5,121) | (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 | 509 | 463
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (4) | (9)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,050 | 2,504
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (164) | (135)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,559 | 2,967
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (168) | (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 | 5,388 | 2,464
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (94) | (43)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 15,668 | 15,971
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,095) | (957)
Debt Securities, Available-for-sale, Unrealized Loss Position | 21,056 | 18,435
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,189) | (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 | 5,903 | 2,866
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (68) | (51)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 19,214 | 20,334
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,476) | (1,194)
Debt Securities, Available-for-sale, Unrealized Loss Position | 25,117 | 23,200
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,544) | (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 | 5,439 | 1,659
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (57) | (58)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 14,205 | 13,831
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,999) | (1,706)
Debt Securities, Available-for-sale, Unrealized Loss Position | 19,644 | 15,490
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2,056) | (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 | 154 | 1,117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (3) | (15)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,469 | 1,310
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (161) | (137)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,623 | 2,427
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (164) | $ (152)

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