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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Argentina [member]      
Disclosure of information about consolidated structured entities [Line Items]      
Acquisition of unproved properties $ 276    
Acquisition of proved properties 166 $ 154 $ 2,093
Exploration costs 7,283 3,302 2,922
Development costs 53,553 39,039 49,302
Total costs incurred 61,278 42,495 54,317
Other foreign [Member]      
Disclosure of information about consolidated structured entities [Line Items]      
Exploration costs 381 149 517
Development costs     25
Total costs incurred 381 149 542
Worldwide [member]      
Disclosure of information about consolidated structured entities [Line Items]      
Acquisition of unproved properties 276    
Acquisition of proved properties 166 154 2,093
Exploration costs 7,664 3,451 3,439
Development costs 53,553 39,039 49,327
Total costs incurred $ 61,659 $ 42,644 $ 54,859