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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 | Dec. 31, 2018 | Dec. 31, 2017
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Investment [Line Items] |  |
Investment securities, Continuous Unrealized loss position, 0-12 Months, Fair Value |  | $ 28,685
Investment Securities, Continuous Unrealized Loss position, Less than 12 Months, Accumulated Loss |  | (257)
Investment securities, Continuous Unrealized loss position, Over 12 Months, Fair Value |  | 8,885
Investment securities, Continuous Unrealized loss position, Over 12 Months, Gross Unrealized Loss |  | (227)
Investment securities, Continuous Unrealized loss position, Total Fair Value |  | 37,570
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (484)
Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 34,952 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (953) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 27,762 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (817) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 62,714 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,770) |
Investment securities, Continuous Unrealized loss position, 0-12 Months, Fair Value |  | 28,492
Investment Securities, Continuous Unrealized Loss position, Less than 12 Months, Accumulated Loss |  | (237)
Investment securities, Continuous Unrealized loss position, Over 12 Months, Fair Value |  | 8,885
Investment securities, Continuous Unrealized loss position, Over 12 Months, Gross Unrealized Loss |  | (227)
Investment securities, Continuous Unrealized loss position, Total Fair Value |  | 37,377
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (464)
Equity securities |  |
Investment [Line Items] |  |
Investment securities, Continuous Unrealized loss position, 0-12 Months, Fair Value |  | 115
Investment Securities, Continuous Unrealized Loss position, Less than 12 Months, Accumulated Loss |  | (12)
Investment securities, Continuous Unrealized loss position, Over 12 Months, Fair Value |  | 0
Investment securities, Continuous Unrealized loss position, Over 12 Months, Gross Unrealized Loss |  | 0
Investment securities, Continuous Unrealized loss position, Total Fair Value |  | 115
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (12)
U.S. Treasury and agency | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 523 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (4) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,859 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (50) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,382 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (54) |
Investment securities, Continuous Unrealized loss position, 0-12 Months, Fair Value |  | 2,172
Investment Securities, Continuous Unrealized Loss position, Less than 12 Months, Accumulated Loss |  | (14)
Investment securities, Continuous Unrealized loss position, Over 12 Months, Fair Value |  | 1,249
Investment securities, Continuous Unrealized loss position, Over 12 Months, Gross Unrealized Loss |  | (26)
Investment securities, Continuous Unrealized loss position, Total Fair Value |  | 3,421
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (40)
Foreign | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 6,764 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (208) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 5,349 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (159) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 12,113 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (367) |
Investment securities, Continuous Unrealized loss position, 0-12 Months, Fair Value |  | 5,657
Investment Securities, Continuous Unrealized Loss position, Less than 12 Months, Accumulated Loss |  | (65)
Investment securities, Continuous Unrealized loss position, Over 12 Months, Fair Value |  | 1,693
Investment securities, Continuous Unrealized loss position, Over 12 Months, Gross Unrealized Loss |  | (49)
Investment securities, Continuous Unrealized loss position, Total Fair Value |  | 7,350
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (114)
Corporate securities | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 16,538 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (599) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4,873 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (255) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 21,411 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (854) |
Investment securities, Continuous Unrealized loss position, 0-12 Months, Fair Value |  | 5,210
Investment Securities, Continuous Unrealized Loss position, Less than 12 Months, Accumulated Loss |  | (56)
Investment securities, Continuous Unrealized loss position, Over 12 Months, Fair Value |  | 1,332
Investment securities, Continuous Unrealized loss position, Over 12 Months, Gross Unrealized Loss |  | (46)
Investment securities, Continuous Unrealized loss position, Total Fair Value |  | 6,542
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (102)
Mortgage-backed securities | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 6,103 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (98) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 6,913 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (229) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 13,016 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (327) |
Investment securities, Continuous Unrealized loss position, 0-12 Months, Fair Value |  | 6,194
Investment Securities, Continuous Unrealized Loss position, Less than 12 Months, Accumulated Loss |  | (31)
Investment securities, Continuous Unrealized loss position, Over 12 Months, Fair Value |  | 3,209
Investment securities, Continuous Unrealized loss position, Over 12 Months, Gross Unrealized Loss |  | (74)
Investment securities, Continuous Unrealized loss position, Total Fair Value |  | 9,403
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (105)
States, municipalities, and political subdivisions | Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 5,024 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (44) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 7,768 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (124) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 12,792 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (168) |
Investment securities, Continuous Unrealized loss position, 0-12 Months, Fair Value |  | 9,259
Investment Securities, Continuous Unrealized Loss position, Less than 12 Months, Accumulated Loss |  | (71)
Investment securities, Continuous Unrealized loss position, Over 12 Months, Fair Value |  | 1,402
Investment securities, Continuous Unrealized loss position, Over 12 Months, Gross Unrealized Loss |  | (32)
Investment securities, Continuous Unrealized loss position, Total Fair Value |  | 10,661
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (103)
Other investments |  |
Investment [Line Items] |  |
Investment securities, Continuous Unrealized loss position, 0-12 Months, Fair Value |  | 78
Investment Securities, Continuous Unrealized Loss position, Less than 12 Months, Accumulated Loss |  | (8)
Investment securities, Continuous Unrealized loss position, Over 12 Months, Fair Value |  | 0
Investment securities, Continuous Unrealized loss position, Over 12 Months, Gross Unrealized Loss |  | 0
Investment securities, Continuous Unrealized loss position, Total Fair Value |  | 78
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (8)

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