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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) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Investment [Line Items] |  |
Document Period End Date | Dec. 31, 2019 |
Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 5,563 | $ 34,952
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (81) | (953)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,337 | 27,762
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (88) | (817)
Debt Securities, Available-for-sale, Unrealized Loss Position | 8,900 | 62,714
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (169) | (1,770)
U.S. Treasury and agency | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 234 | 523
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1) | (4)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 339 | 2,859
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | (50)
Debt Securities, Available-for-sale, Unrealized Loss Position | 573 | 3,382
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1) | (54)
Foreign | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,846 | 6,764
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (34) | (208)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 802 | 5,349
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (28) | (159)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,648 | 12,113
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (62) | (367)
Corporate securities | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,121 | 16,538
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (40) | (599)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 988 | 4,873
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (40) | (255)
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,109 | 21,411
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (80) | (854)
Mortgage-backed securities | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,174 | 6,103
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (6) | (98)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 932 | 6,913
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (8) | (229)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,106 | 13,016
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (14) | (327)
States, municipalities, and political subdivisions | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 188 | 5,024
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (44)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 276 | 7,768
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (12) | (124)
Debt Securities, Available-for-sale, Unrealized Loss Position | 464 | 12,792
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (12) | $ (168)

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