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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 | Sep. 30, 2021 | Dec. 31, 2020
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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 | $ 18,808 | $ 4,755
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (339) | (75)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,607 | 758
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (65) | (22)
Debt Securities, Available-for-sale, Unrealized Loss Position | 20,415 | 5,513
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (404) | (97)
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 | 231 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (5) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 231 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (5) |
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 | 5,704 | 1,628
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (147) | (35)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 780 | 114
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (40) | (5)
Debt Securities, Available-for-sale, Unrealized Loss Position | 6,484 | 1,742
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (187) | (40)
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 | 6,686 | 2,212
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (124) | (33)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 662 | 593
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (20) | (14)
Debt Securities, Available-for-sale, Unrealized Loss Position | 7,348 | 2,805
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (144) | (47)
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 | 5,948 | 875
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (61) | (6)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 157 | 35
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (4) | (2)
Debt Securities, Available-for-sale, Unrealized Loss Position | 6,105 | 910
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (65) | (8)
Municipal |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 239 | 40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2) | (1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 8 | 16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1) | (1)
Debt Securities, Available-for-sale, Unrealized Loss Position | 247 | 56
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (3) | $ (2)

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