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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) - Fixed Maturities [Member] - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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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 | $ 27,035 | $ 57,189
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (974) | (4,115)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 56,471 | 14,991
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (7,062) | (2,291)
Debt Securities, Available-for-sale, Unrealized Loss Position | 83,506 | 72,180
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (8,036) | (6,406)
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 | 1,108 | 2,152
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (32) | (125)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,449 | 386
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (233) | (46)
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,557 | 2,538
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (265) | (171)
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 | 8,591 | 15,538
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (280) | (1,012)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 16,631 | 5,490
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,670) | (704)
Debt Securities, Available-for-sale, Unrealized Loss Position | 25,222 | 21,028
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,950) | (1,716)
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 | 10,120 | 25,687
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (362) | (1,793)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 22,672 | 4,190
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2,441) | (552)
Debt Securities, Available-for-sale, Unrealized Loss Position | 32,792 | 29,877
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2,803) | (2,345)
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 | 5,827 | 10,561
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (249) | (1,033)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 13,450 | 4,770
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2,510) | (941)
Debt Securities, Available-for-sale, Unrealized Loss Position | 19,277 | 15,331
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2,759) | (1,974)
Municipal |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,389 | 3,251
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (51) | (152)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,269 | 155
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (208) | (48)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,658 | 3,406
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (259) | $ (200)

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