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Unrecognized Tax Benefits Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Income Taxes [Line Items] |  |  |  |
Unrecognized tax benefits, non-current income taxes payable | $ 46 | $ 40 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 26 | 29 |  |
Unrecognized Tax Benefits | 63 | 59 | $ 56 | $ 63
Non Avis Budget Car Rental Tax Contingencies |  |  |  |
Income Taxes [Line Items] |  |  |  |
Unrecognized Tax Benefits | $ 13 | $ 15 |  |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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