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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, 2021 | Dec. 31, 2020
Investment [Line Items] |  |
Document Period End Date | Dec. 31, 2021 |
Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 25,041 | $ 4,755
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (465) | (75)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,159 | 758
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (104) | (22)
Debt Securities, Available-for-sale, Unrealized Loss Position | 27,200 | 5,513
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (569) | (97)
U.S. Treasury and agency | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 363 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (3) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 70 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 433 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (6) |
Foreign | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 6,917 | 1,628
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (196) | (35)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,093 | 114
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (62) | (5)
Debt Securities, Available-for-sale, Unrealized Loss Position | 8,010 | 1,742
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (258) | (40)
Corporate securities | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 9,449 | 2,212
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (145) | (33)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 806 | 593
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (32) | (14)
Debt Securities, Available-for-sale, Unrealized Loss Position | 10,255 | 2,805
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (177) | (47)
Mortgage-backed securities | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 8,086 | 875
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (116) | (6)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 190 | 35
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (7) | (2)
Debt Securities, Available-for-sale, Unrealized Loss Position | 8,276 | 910
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (123) | (8)
States, municipalities, and political subdivisions | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 226 | 40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (5) | (1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | (1)
Debt Securities, Available-for-sale, Unrealized Loss Position | 226 | 56
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (5) | $ (2)

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