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Lease liabilities - Summary of lease liabilities activity (Detail) - ARS ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Lease liabilities [abstract] |  |
Balance at the beginning of the year | $ 61,780 | $ 23,059
Leases increase | 11,421 | 39,779
Financial accretion | 5,706 | 2,885
Leases decrease | (28,914) | (1,741)
Payments | (23,290) | (15,208)
Exchange and translation differences, net | 19,548 | 12,999
Result from net monetary position | 19 | 7
Balance at the end of year | $ 46,270 | $ 61,780

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- Definition The cash outflow for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_g&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_CashOutflowForLeases
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_LeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Additions to lease liabilities. + References No definition available. + Details
Name: | ypf_AdditionsToLeaseLiabilities
Namespace Prefix: | ypf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deletions to lease liabilities. + References No definition available. + Details
Name: | ypf_DeletionsToLeaseLiabilities
Namespace Prefix: | ypf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase decrease through exchange and translation differences, lease liabilities. + References No definition available. + Details
Name: | ypf_IncreaseDecreaseThroughExchangeAndTranslationDifferencesLeaseLiabilities
Namespace Prefix: | ypf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Increase decrease through net monetary position, lease liabilities. + References No definition available. + Details
Name: | ypf_IncreaseDecreaseThroughNetMonetaryPositionLeaseLiabilities
Namespace Prefix: | ypf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Interest expenses on lease liabilities incurred. + References No definition available. + Details
Name: | ypf_InterestExpensesOnLeaseLiabilitiesIncurred
Namespace Prefix: | ypf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration