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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Line Items] |  |  |  |
Deferred income taxes |  | $ (14) | $ 192 | $ (51)
Federal net operating loss carryforwards net of valuation allowances |  | 23 |  |
Foreign net operating loss carryforwards |  | 903 |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  | 3 | 0 | $ 0
Deferred Tax Liabilities, Undistributed Foreign Earnings |  | 699 |  |
Internal Revenue Service (IRS) |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Federal net operating loss carryforwards net of valuation allowances |  | 4,900 |  |
Provision adjustment due to corporate tax rate change [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred income taxes |  | $ (30) | 317 |
Provision adjustment due to anticipated repatriation of foreign earnings [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred income taxes | $ (30) |  | $ (104) |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115928272&loc=d3e28680-109314 + Details
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