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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year $ 1,069,011 $ 699,087  
Amount at end of year 1,379,527 1,069,011 $ 699,087
Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 3,736,313 2,238,391 1,062,055
Increases 96,278 172,844 83,648
Translation effect 1,493,677 1,322,423 1,098,627
Adjustment for inflation 27,585 24,975 36,802
Decreases and reclassifications (29,597) (22,320) (42,741)
Amount at end of year 5,324,256 3,736,313 2,238,391
Accumulated depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 2,579,363 1,498,288 679,425
Increases 214,313 163,329 98,869
Translation effect 1,072,346 907,519 727,292
Adjustment for inflation 13,940 12,988 20,536
Decreases and reclassifications (11,854) (2,761) (27,834)
Amount at end of year 3,868,108 2,579,363 1,498,288
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 1,156,950 740,103 382,630
Amount at end of year 1,456,148 1,156,950 740,103
Land and buildings [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 77,193 48,047 21,394
Increases 62 46 425
Translation effect 27,498 24,838 20,845
Adjustment for inflation 3,600 3,382 5,096
Decreases and reclassifications (589) 880 287
Amount at end of year 107,764 77,193 48,047
Land and buildings [member] | Accumulated depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 36,553 22,114 9,250
Increases 2,054 1,260 758
Translation effect 13,013 11,444 9,356
Adjustment for inflation 1,801 1,726 2,785
Decreases and reclassifications (1,647) 9 (35)
Amount at end of year 51,774 36,553 22,114
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 40,640 25,933 12,144
Amount at end of year 55,990 40,640 25,933
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 2,688,553 1,604,868 775,353
Increases (13,412) 1,980 (10,216)
Translation effect 1,110,354 967,212 808,772
Adjustment for inflation     152
Decreases and reclassifications 93,720 114,493 30,807
Amount at end of year 3,879,215 2,688,553 1,604,868
Mining Property, Wells and Related Equipment [member] | Accumulated depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 2,125,588 1,231,930 566,334
Increases 171,786 137,017 82,939
Translation effect 896,732 758,928 609,973
Adjustment for inflation     141
Decreases and reclassifications (8,915) (2,287) (27,457)
Amount at end of year 3,185,191 2,125,588 1,231,930
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 562,965 372,938 209,019
Amount at end of year 694,024 562,965 372,938
Refinery equipment and petrochemical plants [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 472,630 280,451 134,675
Increases 1,724 4,676 370
Translation effect 194,960 171,788 138,924
Decreases and reclassifications 13,872 15,715 6,482
Amount at end of year 683,186 472,630 280,451
Refinery equipment and petrochemical plants [member] | Accumulated depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 261,965 152,295 69,160
Increases 27,195 16,092 9,517
Translation effect 111,376 93,611 73,643
Decreases and reclassifications   (33) (25)
Amount at end of year 400,536 261,965 152,295
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 210,665 128,156 65,515
Amount at end of year 282,650 210,665 128,156
Transportation equipment [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 27,042 16,162 7,614
Increases 119 83 38
Translation effect 10,051 8,723 7,400
Adjustment for inflation 902 716 797
Decreases and reclassifications 205 1,358 313
Amount at end of year 38,319 27,042 16,162
Transportation equipment [member] | Accumulated depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 17,951 10,579 4,512
Increases 1,679 1,345 960
Translation effect 6,905 5,917 4,639
Adjustment for inflation 524 486 565
Decreases and reclassifications (360) (376) (97)
Amount at end of year 26,699 17,951 10,579
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 9,091 5,583 3,102
Amount at end of year 11,620 9,091 5,583
Materials and equipment in warehouse [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 62,423 34,990 15,993
Increases 33,422 43,089 19,885
Translation effect 24,712 21,044 15,332
Adjustment for inflation 421 920 1,107
Decreases and reclassifications (31,252) (37,620) (17,327)
Amount at end of year 89,726 62,423 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 62,423 34,990 15,993
Amount at end of year 89,726 62,423 34,990
Drilling and work in progress [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 194,585 124,381 59,529
Increases 72,162 114,878 67,264
Translation effect 61,134 70,818 61,084
Adjustment for inflation 2,575 1,326 792
Decreases and reclassifications (106,547) (116,818) (64,288)
Amount at end of year 223,909 194,585 124,381
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 194,585 124,381 59,529
Amount at end of year 223,909 194,585 124,381
Exploratory Drilling in Progress [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 11,386 7,972 2,871
Increases 152 6,532 5,438
Translation effect 2,605 5,014 3,851
Decreases and reclassifications (10,245) (8,132) (4,188)
Amount at end of year 3,898 11,386 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 11,386 7,972 2,871
Amount at end of year 3,898 11,386 7,972
Furniture, fixtures and installations [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 41,017 24,717 10,454
Increases 121 106 59
Translation effect 17,133 14,289 10,935
Adjustment for inflation 537 828 1,371
Decreases and reclassifications 3,997 1,077 1,898
Amount at end of year 62,805 41,017 24,717
Furniture, fixtures and installations [member] | Accumulated depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 35,117 20,707 8,686
Increases 4,092 2,536 1,561
Translation effect 14,394 11,935 9,158
Adjustment for inflation 489 773 1,309
Decreases and reclassifications (117) (834) (7)
Amount at end of year 53,975 35,117 20,707
Furniture, fixtures 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 5,900 4,010 1,768
Amount at end of year 8,830 5,900 4,010
Selling equipment [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 70,135 40,998 18,788
Translation effect 30,261 25,116 20,016
Decreases and reclassifications 6,023 4,021 2,194
Amount at end of year 106,419 70,135 40,998
Selling equipment [member] | Accumulated depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 44,271 25,697 11,656
Increases 4,493 2,765 1,680
Translation effect 18,791 15,822 12,396
Decreases and reclassifications (25) (13) (35)
Amount at end of year 67,530 44,271 25,697
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 25,864 15,301 7,132
Amount at end of year 38,889 25,864 15,301
Infrastructure for Natural Gas Distribution [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 44,643 24,168 3,406
Increases 1,587 865  
Adjustment for inflation 16,134 13,010 20,519
Decreases and reclassifications 1,735 6,600 243
Amount at end of year 64,099 44,643 24,168
Infrastructure for Natural Gas Distribution [member] | Accumulated depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 23,877 12,508 1,381
Increases 1,287 989 677
Adjustment for inflation 8,629 6,733 10,584
Decreases and reclassifications (221) 3,647 (134)
Amount at end of year 33,572 23,877 12,508
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 20,766 11,660 2,025
Amount at end of year 30,527 20,766 11,660
Other Property [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 46,706 31,637 11,978
Increases 341 589 385
Translation effect 14,969 13,581 11,468
Adjustment for inflation 3,416 4,793 6,968
Decreases and reclassifications (516) (3,894) 838
Amount at end of year 64,916 46,706 31,637
Other Property [member] | Accumulated depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount at beginning of year 34,041 22,458 8,446
Increases 1,727 1,325 777
Translation effect 11,135 9,862 8,127
Adjustment for inflation 2,497 3,270 5,152
Decreases and reclassifications (569) (2,874) (44)
Amount at end of year 48,831 34,041 22,458
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 12,665 9,179 3,532
Amount at end of year $ 16,085 $ 12,665 $ 9,179