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Investments (Aggregate Fair Value And Gross Unrealized Loss By Length Of Time Security Has Continuously Been In Unrealized Loss Position) (Detail) - Fixed Maturities [Member] - USD ($) $ in Millions | Jun. 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 | $ 62,944 | $ 25,041
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (5,004) | (465)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 5,372 | 2,159
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (737) | (104)
Debt Securities, Available-for-sale, Unrealized Loss Position | 68,316 | 27,200
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (5,741) | (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 | 1,707 | 363
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (70) | (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 95 | 70
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (10) | (3)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,802 | 433
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (80) | (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 | 15,832 | 6,917
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,331) | (196)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,578 | 1,093
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (334) | (62)
Debt Securities, Available-for-sale, Unrealized Loss Position | 18,410 | 8,010
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,665) | (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 | 27,714 | 9,449
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2,346) | (145)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,395 | 806
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (204) | (32)
Debt Securities, Available-for-sale, Unrealized Loss Position | 29,109 | 10,255
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2,550) | (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 | 15,048 | 8,086
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,140) | (116)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,294 | 190
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (187) | (7)
Debt Securities, Available-for-sale, Unrealized Loss Position | 16,342 | 8,276
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,327) | (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 | 2,643 | 226
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (117) | (5)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 10 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,653 | 226
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (119) | $ (5)

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