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Expenses by Nature - Detailed Information about Expenses by Nature (Parenthetical) (Detail) - ARS ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Expenses by nature [abstract] |  |  |  |
Export withholdings | $ 1,612.0 | $ 1,317.0 | $ 1,220.0 |
Fees and remunerations of the Directors and Statutory Auditors of YPF | 48.8 | 126.0 | 140.0 | $ 123.0
Fees approved by General and Extraordinay Shareholders' Meeting of YPF | 48.3 | 127.0 | 146.0 |
Research and development expense | $ 449.0 | $ 400.0 | $ 270.0 |

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of expenditure directly attributable to research or development activities, recognised in profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 126 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_126&doctype=Standard -URIDate 2017-03-09 + Details
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Balance Type: | debit
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- Definition Directors and auditors remuneration expense. + References No definition available. + Details
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Namespace Prefix: | ypf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Export withholdings. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fees and remuneration expense. + References No definition available. + Details
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Namespace Prefix: | ypf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration