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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Line Items] |  |  |
Deferred income taxes | $ 192 | $ (51) | $ (58)
Federal net operating loss carryforwards net of valuation allowances | 19 |  |
Foreign net operating loss carryforwards | 889 |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 0 | $ 0 | $ 1
Deferred Tax Liabilities, Undistributed Foreign Earnings | 1,300 |  |
Internal Revenue Service (IRS) |  |  |
Income Tax Disclosure [Line Items] |  |  |
Federal net operating loss carryforwards net of valuation allowances | $ 3,200 |  |
Internal Revenue Service (IRS) | Maximum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carryforwards expiration period | Jan. 01, 2031 |  |
Other Tax [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | $ 98 |  |
Provision adjustment due to corporate tax rate change [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred income taxes | 317 |  |
Provision adjustment due to anticipated repatriation of foreign earnings [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred income taxes | $ (104) |  |

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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 + Details
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