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Financial risk management and fair value estimates (Details) - Market Risk [Member] $ in Millions, $ in Millions, $ in Millions | Jun. 30, 2018 USD ($) | Jun. 30, 2018 UYU ($) | Jun. 30, 2018 ARS ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 UYU ($) | Jun. 30, 2017 ARS ($)
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Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |  |  |
Net monetary position (Liability)/Asset US |  |  | $ (13,692) |  |  | $ (11,567)
Net monetary position (Liability)/Asset NIS |  |  |  |  |  | 1
Argentina, Pesos |  |  |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |  |  |
Net monetary position (Liability)/Asset US |  |  | $ (13,324) |  |  | (11,436)
Net monetary position (Liability)/Asset NIS |  |  |  |  |  |
UYU |  |  |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |  |  |
Net monetary position (Liability)/Asset US |  | $ (368) |  |  | $ (131) |
Net monetary position (Liability)/Asset NIS |  |  |  |  |  |
USD |  |  |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |  |  |
Net monetary position (Liability)/Asset US |  |  |  |  |  |
Net monetary position (Liability)/Asset NIS |  |  |  | $ 1 |  |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Amount of net monetary position liability asset classified as US. + References No definition available. + Details
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