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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, 2022 | Dec. 31, 2021
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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 | $ 63,672 | $ 25,041
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (6,132) | (465)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 10,149 | 2,159
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,819) | (104)
Debt Securities, Available-for-sale, Unrealized Loss Position | 73,821 | 27,200
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (7,951) | (569)
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 | 1,873 | 363
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (145) | (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 227 | 70
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (29) | (3)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,100 | 433
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (174) | (6)
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 | 16,585 | 6,917
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,480) | (196)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,907 | 1,093
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (588) | (62)
Debt Securities, Available-for-sale, Unrealized Loss Position | 20,492 | 8,010
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2,068) | (258)
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 | 28,533 | 9,449
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2,832) | (145)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,621 | 806
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (456) | (32)
Debt Securities, Available-for-sale, Unrealized Loss Position | 31,154 | 10,255
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (3,288) | (177)
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 | 12,776 | 8,086
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,459) | (116)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,324 | 190
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (728) | (7)
Debt Securities, Available-for-sale, Unrealized Loss Position | 16,100 | 8,276
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2,187) | (123)
Municipal |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 3,905 | 226
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (216) | (5)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 70 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (18) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,975 | 226
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (234) | $ (5)

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