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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, 2020 | Dec. 31, 2019
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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 | $ 10,668 | $ 5,563
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (247) | (81)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 923 | 3,337
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (59) | (88)
Debt Securities, Available-for-sale, Unrealized Loss Position | 11,591 | 8,900
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (306) | (169)
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 |  | 234
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 339
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 573
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | (1)
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 | 2,848 | 1,846
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (89) | (34)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 122 | 802
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (14) | (28)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,970 | 2,648
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (103) | (62)
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 | 6,149 | 2,121
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (145) | (40)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 721 | 988
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (41) | (40)
Debt Securities, Available-for-sale, Unrealized Loss Position | 6,870 | 3,109
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (186) | (80)
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 | 1,481 | 1,174
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (11) | (6)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 26 | 932
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2) | (8)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,507 | 2,106
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (13) | (14)
Municipal |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 190 | 188
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2) | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 54 | 276
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2) | (12)
Debt Securities, Available-for-sale, Unrealized Loss Position | 244 | 464
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (4) | $ (12)

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