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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, 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 | $ 12,205 | $ 5,563
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (426) | (81)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 748 | 3,337
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (61) | (88)
Debt Securities, Available-for-sale, Unrealized Loss Position | 12,953 | 8,900
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (487) | (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 | 3,172 | 1,846
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (117) | (34)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 105 | 802
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (22) | (28)
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,277 | 2,648
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (139) | (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 | 7,985 | 2,121
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (295) | (40)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 551 | 988
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (35) | (40)
Debt Securities, Available-for-sale, Unrealized Loss Position | 8,536 | 3,109
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (330) | (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 | 953 | 1,174
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (13) | (6)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 27 | 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 | 980 | 2,106
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (15) | (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 | 95 | 188
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1) | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 65 | 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 | 160 | 464
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (3) | $ (12)

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