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Right-of-use Assets -Summary of Evolution of the Group's Right-of-use Assets (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [line items]    
Balances $ 61,391  
Increases 11,421 $ 39,779
Balances 44,081 61,391
Land and buildings [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Balances 773  
Balances 622 773
Exploitation Facilities and Equipment [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Balances 16,604  
Balances 14,965 16,604
Machinery and equipment [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Balances 29,225  
Balances 15,297 29,225
Gas Stations [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Balances 4,646  
Balances 5,506 4,646
Transportation equipment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Balances 10,143  
Balances 7,691 10,143
Initial application of IFRS 16 [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Balances   23,059
Initial application of IFRS 16 [Member] | Land and buildings [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Balances   450
Initial application of IFRS 16 [Member] | Exploitation Facilities and Equipment [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Balances   6,732
Initial application of IFRS 16 [Member] | Machinery and equipment [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Balances   8,612
Initial application of IFRS 16 [Member] | Gas Stations [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Balances   3,356
Initial application of IFRS 16 [Member] | Transportation equipment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Balances   3,909
Cost [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Increases 11,421 39,779
Decreases and reclassifications (35,057) (2,548)
Translation differences 28,095 15,318
Adjustment for inflation 328 275
Right of use assets 80,670 75,883
Cost [member] | Land and buildings [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Increases 11 266
Decreases and reclassifications (90)  
Translation differences 396 310
Adjustment for inflation 7  
Right of use assets 1,350 1,026
Cost [member] | Exploitation Facilities and Equipment [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Increases 4,116 13,129
Decreases and reclassifications (9,212) (1,162)
Translation differences 9,187 4,587
Right of use assets 27,377 23,286
Cost [member] | Machinery and equipment [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Increases 4,781 19,429
Decreases and reclassifications (23,984) (1,264)
Translation differences 11,275 6,189
Right of use assets 25,038 32,966
Cost [member] | Gas Stations [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Increases 97 163
Decreases and reclassifications   (58)
Translation differences 1,863 1,687
Adjustment for inflation 321 275
Right of use assets 7,704 5,423
Cost [member] | Transportation equipment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Increases 2,416 6,792
Decreases and reclassifications (1,771) (64)
Translation differences 5,374 2,545
Right of use assets 19,201 13,182
Accumulated depreciation [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Increases 21,662 12,530
Decreases and reclassifications (8,870) (807)
Translation differences 9,232 2,769
Adjustment for inflation 73  
Right of use assets 36,589 14,492
Accumulated depreciation [member] | Land and buildings [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Increases 325 208
Decreases and reclassifications (10)  
Translation differences 155 45
Adjustment for inflation 5  
Right of use assets 728 253
Accumulated depreciation [member] | Exploitation Facilities and Equipment [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Increases 7,315 6,051
Decreases and reclassifications (5,260) (507)
Translation differences 3,675 1,138
Right of use assets 12,412 6,682
Accumulated depreciation [member] | Machinery and equipment [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Increases 6,336 3,174
Decreases and reclassifications (2,833) (283)
Translation differences 2,497 850
Right of use assets 9,741 3,741
Accumulated depreciation [member] | Gas Stations [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Increases 973 667
Decreases and reclassifications   (7)
Translation differences 380 117
Adjustment for inflation 68  
Right of use assets 2,198 777
Accumulated depreciation [member] | Transportation equipment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Increases 6,713 2,430
Decreases and reclassifications (767) (10)
Translation differences 2,525 619
Right of use assets $ 11,510 $ 3,039