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Investments - Securities Available-for-Sale in Gross Unrealized Loss Position (Detail) - USD ($) $ in Millions | Jun. 30, 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 | $ 776 | $ 8,543
Gross Unrealized Losses, Less than 12 Months | 22 | 340
Estimated Fair Value, 12 Months or Longer | 498 | 825
Gross Unrealized Losses, 12 Months or Longer | 22 | 55
Total Estimated Fair Value | 1,274 | 9,368
Total Gross Unrealized Losses | 44 | 395
States, Municipalities and Political Subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 19 | 517
Gross Unrealized Losses, Less than 12 Months |  | 8
Estimated Fair Value, 12 Months or Longer | 2 | 5
Gross Unrealized Losses, 12 Months or Longer |  | 1
Total Estimated Fair Value | 21 | 522
Total Gross Unrealized Losses |  | 9
Residential Mortgage-Backed [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 163 | 1,932
Gross Unrealized Losses, Less than 12 Months |  | 23
Estimated Fair Value, 12 Months or Longer | 134 | 1,119
Gross Unrealized Losses, 12 Months or Longer | 2 | 34
Total Estimated Fair Value | 297 | 3,051
Total Gross Unrealized Losses | 2 | 57
Commercial Mortgage-Backed [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 58 | 728
Gross Unrealized Losses, Less than 12 Months | 2 | 10
Estimated Fair Value, 12 Months or Longer | 69 | 397
Gross Unrealized Losses, 12 Months or Longer | 2 | 22
Total Estimated Fair Value | 127 | 1,125
Total Gross Unrealized Losses | 4 | 32
Other Asset-Backed [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 386 | 834
Gross Unrealized Losses, Less than 12 Months | 5 | 21
Estimated Fair Value, 12 Months or Longer | 77 | 125
Gross Unrealized Losses, 12 Months or Longer | 2 | 3
Total Estimated Fair Value | 463 | 959
Total Gross Unrealized Losses | 7 | 24
Total Asset-Backed [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 607 | 3,494
Gross Unrealized Losses, Less than 12 Months | 7 | 54
Estimated Fair Value, 12 Months or Longer | 280 | 1,641
Gross Unrealized Losses, 12 Months or Longer | 6 | 59
Total Estimated Fair Value | 887 | 5,135
Total Gross Unrealized Losses | 13 | 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 |  | 21
Estimated Fair Value, 12 Months or Longer | 4 | 19
Total Estimated Fair Value | 4 | 40
Foreign Government [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 3 | 114
Gross Unrealized Losses, Less than 12 Months |  | 2
Estimated Fair Value, 12 Months or Longer | 11 | 124
Gross Unrealized Losses, 12 Months or Longer |  | 2
Total Estimated Fair Value | 14 | 238
Total Gross Unrealized Losses |  | 4
Fixed Maturity Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 1,405 | 12,689
Gross Unrealized Losses, Less than 12 Months | 29 | 404
Estimated Fair Value, 12 Months or Longer | 795 | 2,614
Gross Unrealized Losses, 12 Months or Longer | 28 | 117
Total Estimated Fair Value | 2,200 | 15,303
Total Gross Unrealized Losses | $ 57 | $ 521

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- 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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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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