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Property Plant and Equipment - Summary of Changes in Property Plant and Equipment (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year $ 354,443 $ 308,014  
Amount at end of year 699,087 354,443 $ 308,014
Reductions for deconsolidation of subsidiaries 500    
Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 1,062,055 868,411 668,198
Increases 83,648 53,096 65,048
Translation effect 1,098,627 154,172 147,534
Adjustment for inflation 36,802    
Decreases and reclassifications (42,741) (13,624) (12,369)
Amount at end of year   1,062,055 868,411
Accumulated depreciation and amortization [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 679,425 522,732 394,076
Increases 98,869 63,467 47,629
Translation effect 727,292 97,034 88,101
Adjustment for inflation 20,536    
Decreases and reclassifications (27,834) (3,808) (7,074)
Cost of Origin 2,238,391    
Amount at end of year 1,498,288 679,425 522,732
Net book value of property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 382,630 345,679 274,122
Amount at end of year 740,103 382,630 345,679
Land and Buildings [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 21,394 18,429 13,949
Increases 425 49 140
Translation effect 20,845 3,028 2,975
Adjustment for inflation 5,096    
Decreases and reclassifications 287 (112) 1,365
Amount at end of year   21,394 18,429
Land and Buildings [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 9,250 7,497 5,920
Increases 758 437 360
Translation effect 9,356 1,303 1,257
Adjustment for inflation 2,785    
Decreases and reclassifications (35) 13 (40)
Cost of Origin 48,047    
Amount at end of year 22,114 9,250 7,497
Land and Buildings [member] | Net book value of property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 12,144 10,932 8,029
Amount at end of year 25,933 12,144 10,932
Mining Property, Wells and Related Equipment [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 775,353 625,628 458,066
Increases (10,216) (4,370) 3,831
Translation effect 808,772 113,481 104,086
Adjustment for inflation 152    
Decreases and reclassifications 30,807 40,614 59,645
Amount at end of year   775,353 625,628
Mining Property, Wells and Related Equipment [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 566,334 432,002 324,922
Increases 82,939 54,980 40,729
Translation effect 609,973 81,108 73,288
Adjustment for inflation 141    
Decreases and reclassifications (27,457) (1,756) (6,937)
Cost of Origin 1,604,868    
Amount at end of year 1,231,930 566,334 432,002
Mining Property, Wells and Related Equipment [member] | Net book value of property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 209,019 193,626 133,144
Amount at end of year 372,938 209,019 193,626
Refinery equipment and petrochemical plants [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 134,675 112,560 69,429
Increases 370 103 1
Translation effect 138,924 19,728 16,601
Decreases and reclassifications 6,482 2,284 26,529
Amount at end of year   134,675 112,560
Refinery equipment and petrochemical plants [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 69,160 54,735 41,138
Increases 9,517 5,395 4,312
Translation effect 73,643 9,983 9,288
Decreases and reclassifications (25) (953) (3)
Cost of Origin 280,451    
Amount at end of year 152,295 69,160 54,735
Refinery equipment and petrochemical plants [member] | Net book value of property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 65,515 57,825 28,291
Amount at end of year 128,156 65,515 57,825
Transportation equipment [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 7,614 5,551 3,650
Increases 38 66 3
Translation effect 7,400 1,032 802
Adjustment for inflation 797    
Decreases and reclassifications 313 965 1,096
Amount at end of year   7,614 5,551
Transportation equipment [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 4,512 3,285 2,392
Increases 960 602 414
Translation effect 4,639 609 516
Adjustment for inflation 565    
Decreases and reclassifications (97) 16 (37)
Cost of Origin 16,162    
Amount at end of year 10,579 4,512 3,285
Transportation equipment [member] | Net book value of property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 3,102 2,266 1,258
Amount at end of year 5,583 3,102 2,266
Materials and equipment in warehouse [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 15,993 14,239 13,478
Increases 19,885 7,394 6,968
Translation effect 15,332 2,101 2,494
Adjustment for inflation 1,107    
Decreases and reclassifications (17,327) (7,741) (8,701)
Amount at end of year   15,993 14,239
Materials and equipment in warehouse [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Cost of Origin 34,990    
Materials and equipment in warehouse [member] | Net book value of property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 15,993 14,239 13,478
Amount at end of year 34,990 15,993 14,239
Drilling and work in progress [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 59,529 52,673 76,803
Increases 67,264 47,453 52,610
Translation effect 61,084 8,568 14,602
Adjustment for inflation 792    
Decreases and reclassifications (64,288) (49,165) (91,342)
Amount at end of year   59,529 52,673
Drilling and work in progress [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Cost of Origin 124,381    
Drilling and work in progress [member] | Net book value of property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 59,529 52,673 76,803
Amount at end of year 124,381 59,529 52,673
Exploratory Drilling in Progress [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 2,871 1,978 3,647
Increases 5,438 2,207 1,392
Translation effect 3,851 373 626
Decreases and reclassifications (4,188) (1,687) (3,687)
Amount at end of year   2,871 1,978
Exploratory Drilling in Progress [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Cost of Origin 7,972    
Exploratory Drilling in Progress [member] | Net book value of property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 2,871 1,978 3,647
Amount at end of year 7,972 2,871 1,978
Furniture Fixture and Installations [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 10,454 8,089 5,603
Increases 59 20 25
Translation effect 10,935 1,466 1,260
Adjustment for inflation 1,371    
Decreases and reclassifications 1,898 879 1,201
Amount at end of year   10,454 8,089
Furniture Fixture and Installations [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 8,686 6,401 4,699
Increases 1,561 717 668
Translation effect 9,158 1,196 1,052
Adjustment for inflation 1,309    
Decreases and reclassifications (7) 372 (18)
Cost of Origin 24,717    
Amount at end of year 20,707 8,686 6,401
Furniture Fixture and Installations [member] | Net book value of property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 1,768 1,688 904
Amount at end of year 4,010 1,768 1,688
Selling equipment [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 18,788 14,346 10,778
Translation effect 20,016 2,744 2,430
Decreases and reclassifications 2,194 1,698 1,138
Amount at end of year   18,788 14,346
Selling equipment [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 11,656 9,119 6,921
Increases 1,680 854 642
Translation effect 12,396 1,684 1,558
Decreases and reclassifications (35) (1) (2)
Cost of Origin 40,998    
Amount at end of year 25,697 11,656 9,119
Selling equipment [member] | Net book value of property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 7,132 5,227 3,857
Amount at end of year 15,301 7,132 5,227
Infrastructure for Natural Gas Distribution [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 3,406 3,191 2,931
Adjustment for inflation 20,519    
Decreases and reclassifications 243 215 260
Amount at end of year   3,406 3,191
Infrastructure for Natural Gas Distribution [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 1,381 1,301 1,181
Increases 677 80 75
Adjustment for inflation 10,584    
Decreases and reclassifications (134)   45
Cost of Origin 24,168    
Amount at end of year 12,508 1,381 1,301
Infrastructure for Natural Gas Distribution [member] | Net book value of property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 2,025 1,890 1,750
Amount at end of year 11,660 2,025 1,890
Electric Power Generation Facilities [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year   1,762 1,573
Increases     2
Decreases and reclassifications   (1,762) 187
Amount at end of year     1,762
Electric Power Generation Facilities [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year   1,394 1,283
Increases   87 111
Decreases and reclassifications   (1,481)  
Amount at end of year     1,394
Electric Power Generation Facilities [member] | Net book value of property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year   368 290
Amount at end of year     368
Other Property [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 11,978 9,965 8,291
Increases 385 174 76
Translation effect 11,468 1,651 1,658
Adjustment for inflation 6,968    
Decreases and reclassifications 838 188 (60)
Amount at end of year   11,978 9,965
Other Property [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 8,446 6,998 5,620
Increases 777 315 318
Translation effect 8,127 1,151 1,142
Adjustment for inflation 5,152    
Decreases and reclassifications (44) (18) (82)
Cost of Origin 31,637    
Amount at end of year 22,458 8,446 6,998
Other Property [member] | Net book value of property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 3,532 2,967 2,671
Amount at end of year $ 9,179 $ 3,532 $ 2,967