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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 | Jun. 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 | $ 30,498 | $ 57,189
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (986) | (4,115)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 48,552 | 14,991
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (5,133) | (2,291)
Debt Securities, Available-for-sale, Unrealized Loss Position | 79,050 | 72,180
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (6,119) | (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 | 1,843 | 2,152
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (70) | (125)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,779 | 386
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (134) | (46)
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,622 | 2,538
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (204) | (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 | 7,895 | 15,538
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (243) | (1,012)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 14,825 | 5,490
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,377) | (704)
Debt Securities, Available-for-sale, Unrealized Loss Position | 22,720 | 21,028
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,620) | (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 | 11,053 | 25,687
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (352) | (1,793)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 19,674 | 4,190
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,718) | (552)
Debt Securities, Available-for-sale, Unrealized Loss Position | 30,727 | 29,877
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2,070) | (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 | 6,081 | 10,561
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (258) | (1,033)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 11,418 | 4,770
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,763) | (941)
Debt Securities, Available-for-sale, Unrealized Loss Position | 17,499 | 15,331
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2,021) | (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 | 3,626 | 3,251
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (63) | (152)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 856 | 155
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (141) | (48)
Debt Securities, Available-for-sale, Unrealized Loss Position | 4,482 | 3,406
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (204) | $ (200)

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