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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, 2020 | Dec. 31, 2019
Investment [Line Items] |  |
Document Period End Date | Dec. 31, 2020 |
Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 4,755 | $ 5,563
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (75) | (81)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 758 | 3,337
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (22) | (88)
Debt Securities, Available-for-sale, Unrealized Loss Position | 5,513 | 8,900
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (97) | (169)
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
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 | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,628 | 1,846
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (35) | (34)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 114 | 802
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (5) | (28)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,742 | 2,648
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (40) | (62)
Corporate securities | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,212 | 2,121
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (33) | (40)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 593 | 988
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (14) | (40)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,805 | 3,109
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (47) | (80)
Mortgage-backed securities | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 875 | 1,174
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (6) | (6)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 35 | 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 | 910 | 2,106
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (8) | (14)
States, municipalities, and political subdivisions | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 40 | 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 | 16 | 276
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1) | (12)
Debt Securities, Available-for-sale, Unrealized Loss Position | 56 | 464
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (2) | $ (12)

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