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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 | Mar. 31, 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 | $ 14,450 | $ 8,569
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (242) | (176)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 52,582 | 53,950
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (4,784) | (4,129)
Debt Securities, Available-for-sale, Unrealized Loss Position | 67,032 | 62,519
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (5,026) | (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 | 632 | 463
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (13) | (9)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,007 | 2,504
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (151) | (135)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,639 | 2,967
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (164) | (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 | 3,793 | 2,464
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (64) | (43)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 15,928 | 15,971
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,079) | (957)
Debt Securities, Available-for-sale, Unrealized Loss Position | 19,721 | 18,435
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,143) | (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 | 4,675 | 2,866
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (71) | (51)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 19,646 | 20,334
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,487) | (1,194)
Debt Securities, Available-for-sale, Unrealized Loss Position | 24,321 | 23,200
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,558) | (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 | 4,907 | 1,659
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (82) | (58)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 13,783 | 13,831
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,919) | (1,706)
Debt Securities, Available-for-sale, Unrealized Loss Position | 18,690 | 15,490
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2,001) | (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 | 443 | 1,117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (12) | (15)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,218 | 1,310
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (148) | (137)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,661 | 2,427
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (160) | $ (152)

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