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Supplemental Information on Oil And Gas Producing Activities (Unaudited) - Costs Incurred for Oil and Gas Producing Activities (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Argentina [member]      
Disclosure of information about consolidated structured entities [Line Items]      
Acquisition of unproved properties $ 715 $ 4,171 $ 276
Acquisition of proved properties     166
Exploration costs 2,348 9,115 7,283
Development costs 61,441 132,289 53,553
Total costs incurred 64,504 145,575 61,278
Other foreign [Member]      
Disclosure of information about consolidated structured entities [Line Items]      
Exploration costs 141 771 381
Total costs incurred 141 771 381
Worldwide [member]      
Disclosure of information about consolidated structured entities [Line Items]      
Acquisition of unproved properties 715 4,171 276
Acquisition of proved properties     166
Exploration costs 2,489 9,886 7,664
Development costs 61,441 132,289 53,553
Total costs incurred $ 64,645 $ 146,346 $ 61,659