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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 |  |

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