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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, 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 | $ 21,577 | $ 5,563
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,288) | (81)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 746 | 3,337
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (87) | (88)
Debt Securities, Available-for-sale, Unrealized Loss Position | 22,323 | 8,900
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,375) | (169)
U.S. Treasury and 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)
Foreign |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 6,534 | 1,846
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (376) | (34)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 132 | 802
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (21) | (28)
Debt Securities, Available-for-sale, Unrealized Loss Position | 6,666 | 2,648
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (397) | (62)
Corporate securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 13,492 | 2,121
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (858) | (40)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 448 | 988
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (51) | (40)
Debt Securities, Available-for-sale, Unrealized Loss Position | 13,940 | 3,109
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (909) | (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 | 914 | 1,174
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (48) | (6)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 36 | 932
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (4) | (8)
Debt Securities, Available-for-sale, Unrealized Loss Position | 950 | 2,106
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (52) | (14)
States, municipalities, and political subdivisions |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 637 | 188
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (6) | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 130 | 276
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (11) | (12)
Debt Securities, Available-for-sale, Unrealized Loss Position | 767 | 464
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (17) | $ (12)

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