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Balances and Transactions with Related Parties - Information Detailed in the Tables below Shows the Balances with Associates and Joint Ventures (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of transactions between related parties [line items]      
Other receivables Current $ 12,684 $ 13,456 $ 19,413
Trade receivables Current 40,649 33,645 22,111
Accounts payable Current 47,371 41,595 39,566
Revenues 252,813 210,100 156,136
Purchases and services 211,812 177,304 119,537
Joint ventures [Member]      
Disclosure of transactions between related parties [line items]      
Other receivables Current 191 106 126
Trade receivables Current 1,423 1,257 815
Accounts payable Current 423 218 427
Revenues 5,911 4,634 3,043
Purchases and services 1,998 1,090 970
Net interest income (loss) 10 3  
Associates [member]      
Disclosure of transactions between related parties [line items]      
Other receivables Current 600 41 38
Trade receivables Current 359 483 292
Accounts payable Current 318 246 218
Revenues 1,044 1,340 553
Purchases and services 1,669 1,303 803
Net interest income (loss) 51 38 8
Joint Ventures and Associates [Member]      
Disclosure of transactions between related parties [line items]      
Other receivables Current 791 147 164
Trade receivables Current 1,782 1,740 1,107
Accounts payable Current 741 464 645
Revenues 6,955 5,974 3,596
Purchases and services 3,667 2,393 1,773
Net interest income (loss) 61 41 8
CDS [Member] | Associates [member]      
Disclosure of transactions between related parties [line items]      
Trade receivables Current 122 108 194
Revenues 102 579 322
Net interest income (loss)   38 8
YPF Gas [Member] | Associates [member]      
Disclosure of transactions between related parties [line items]      
Other receivables Current 589 35 33
Trade receivables Current 230 375 98
Accounts payable Current 15 35 44
Revenues 863 761 231
Purchases and services 51 41 35
Net interest income (loss) 51    
Oldelval [Member] | Associates [member]      
Disclosure of transactions between related parties [line items]      
Accounts payable Current 131 81 56
Purchases and services 596 408 220
Termap [Member] | Associates [member]      
Disclosure of transactions between related parties [line items]      
Accounts payable Current 52 44 44
Purchases and services 366 309 215
OTA [Member] | Associates [member]      
Disclosure of transactions between related parties [line items]      
Accounts payable Current 5 5 2
Purchases and services 25 25 20
OTC [Member] | Associates [member]      
Disclosure of transactions between related parties [line items]      
Other receivables Current 5 2 1
Gasoducto del Pacifico (Argentina) S.A. [member] | Associates [member]      
Disclosure of transactions between related parties [line items]      
Other receivables Current 4 4 4
Accounts payable Current 19 31 27
Purchases and services 202 170 113
Oiltanking [Member] | Associates [member]      
Disclosure of transactions between related parties [line items]      
Accounts payable Current 96 50 45
Revenues 1    
Purchases and services 428 350 200
Gas Austral S.A. [member] | Associates [member]      
Disclosure of transactions between related parties [line items]      
Other receivables Current 2    
Trade receivables Current 7    
Revenues 78    
Purchases and services 1    
Profertil [Member] | Joint ventures [Member]      
Disclosure of transactions between related parties [line items]      
Other receivables Current 107 97 110
Trade receivables Current 239 162 209
Accounts payable Current 215 99 35
Revenues 906 956 823
Purchases and services 901 620 305
MEGA [Member] | Joint ventures [Member]      
Disclosure of transactions between related parties [line items]      
Other receivables Current     12
Trade receivables Current 925 797 481
Accounts payable Current 149 80 381
Revenues 4,058 2,673 1,396
Purchases and services 814 337 470
Refinor [Member] | Joint ventures [Member]      
Disclosure of transactions between related parties [line items]      
Trade receivables Current 224 296 125
Accounts payable Current 8 39 11
Revenues 838 998 824
Purchases and services 225 133 195
Net interest income (loss) 10 3  
Bizoy SA [Member] | Joint ventures [Member]      
Disclosure of transactions between related parties [line items]      
Other receivables Current 5 9 $ 4
Revenues 1 5  
Y-GEN I [member] | Joint ventures [Member]      
Disclosure of transactions between related parties [line items]      
Other receivables Current 57    
Trade receivables Current   2  
Revenues 34 $ 2  
Y-GEN II [member] | Joint ventures [Member]      
Disclosure of transactions between related parties [line items]      
Other receivables Current 22    
Revenues 41    
Petrofaro S.A. [member] | Joint ventures [Member]      
Disclosure of transactions between related parties [line items]      
Trade receivables Current 35    
Accounts payable Current 51    
Revenues 33    
Purchases and services $ 58