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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 | Mar. 31, 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 | $ 49,564 | $ 25,041
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2,244) | (465)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 6,129 | 2,159
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (598) | (104)
Debt Securities, Available-for-sale, Unrealized Loss Position | 55,693 | 27,200
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2,842) | (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 | 946 | 363
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (31) | (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 98 | 70
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (9) | (3)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,044 | 433
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (40) | (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 | 12,654 | 6,917
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (608) | (196)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,385 | 1,093
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (222) | (62)
Debt Securities, Available-for-sale, Unrealized Loss Position | 15,039 | 8,010
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (830) | (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 | 21,082 | 9,449
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (899) | (145)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,041 | 806
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (216) | (32)
Debt Securities, Available-for-sale, Unrealized Loss Position | 23,123 | 10,255
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,115) | (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 | 13,657 | 8,086
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (646) | (116)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,589 | 190
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (150) | (7)
Debt Securities, Available-for-sale, Unrealized Loss Position | 15,246 | 8,276
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (796) | (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 | 1,225 | 226
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (60) | (5)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 16 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,241 | 226
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (61) | $ (5)

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