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Investments - Securities Available-for-Sale in Gross Unrealized Loss Position (Detail) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Corporate Bonds and Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | $ 1,656 | $ 8,543
Gross Unrealized Losses, Less than 12 Months | 39 | 340
Estimated Fair Value, 12 Months or Longer | 1,743 | 825
Gross Unrealized Losses, 12 Months or Longer | 60 | 55
Total Estimated Fair Value | 3,399 | 9,368
Total Gross Unrealized Losses | 99 | 395
States, Municipalities and Political Subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 14 | 517
Gross Unrealized Losses, Less than 12 Months |  | 8
Estimated Fair Value, 12 Months or Longer | 3 | 5
Gross Unrealized Losses, 12 Months or Longer |  | 1
Total Estimated Fair Value | 17 | 522
Total Gross Unrealized Losses |  | 9
Residential Mortgage-Backed [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 94 | 1,932
Gross Unrealized Losses, Less than 12 Months |  | 23
Estimated Fair Value, 12 Months or Longer | 1,494 | 1,119
Gross Unrealized Losses, 12 Months or Longer | 20 | 34
Total Estimated Fair Value | 1,588 | 3,051
Total Gross Unrealized Losses | 20 | 57
Commercial Mortgage-Backed [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 184 | 728
Gross Unrealized Losses, Less than 12 Months | 2 | 10
Estimated Fair Value, 12 Months or Longer | 236 | 397
Gross Unrealized Losses, 12 Months or Longer | 5 | 22
Total Estimated Fair Value | 420 | 1,125
Total Gross Unrealized Losses | 7 | 32
Other Asset-Backed [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 450 | 834
Gross Unrealized Losses, Less than 12 Months | 10 | 21
Estimated Fair Value, 12 Months or Longer | 95 | 125
Gross Unrealized Losses, 12 Months or Longer | 2 | 3
Total Estimated Fair Value | 545 | 959
Total Gross Unrealized Losses | 12 | 24
Total Asset-Backed [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 728 | 3,494
Gross Unrealized Losses, Less than 12 Months | 12 | 54
Estimated Fair Value, 12 Months or Longer | 1,825 | 1,641
Gross Unrealized Losses, 12 Months or Longer | 27 | 59
Total Estimated Fair Value | 2,553 | 5,135
Total Gross Unrealized Losses | 39 | 113
U.S. Treasury and obligations of government-sponsored enterprises [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 48 | 21
Gross Unrealized Losses, Less than 12 Months | 1 |
Estimated Fair Value, 12 Months or Longer | 14 | 19
Total Estimated Fair Value | 62 | 40
Total Gross Unrealized Losses | 1 |
Foreign Government [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 32 | 114
Gross Unrealized Losses, Less than 12 Months | 1 | 2
Estimated Fair Value, 12 Months or Longer | 27 | 124
Gross Unrealized Losses, 12 Months or Longer |  | 2
Total Estimated Fair Value | 59 | 238
Total Gross Unrealized Losses | 1 | 4
Fixed Maturity Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 2,478 | 12,689
Gross Unrealized Losses, Less than 12 Months | 53 | 404
Estimated Fair Value, 12 Months or Longer | 3,612 | 2,614
Gross Unrealized Losses, 12 Months or Longer | 87 | 117
Total Estimated Fair Value | 6,090 | 15,303
Total Gross Unrealized Losses | $ 140 | $ 521

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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