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Provisions (Information) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Provisions [Line Items] |  |
Balance at the beginning of the year | $ 268 |
Provisions recorded during the period | 40 | [1]
Provisions reversed during the period | (5) |
Payments during the period | (44) |
Translation differences | 12 |
Balance at the end of the year | 271 |
Restoration's site and equipment's dismantling [Member] |  |
Provisions [Line Items] |  |
Balance at the beginning of the year | 172 |
Provisions recorded during the period | 17 | [1]
Provisions reversed during the period | 0 |
Payments during the period | (6) |
Translation differences | 11 |
Balance at the end of the year | 194 |
Legal claims [Member] |  |
Provisions [Line Items] |  |
Balance at the beginning of the year | 17 |
Provisions recorded during the period | 19 | [1]
Provisions reversed during the period | (2) |
Payments during the period | (7) |
Translation differences | 1 |
Balance at the end of the year | 28 |
Other [Member] |  |
Provisions [Line Items] |  |
Balance at the beginning of the year | 79 |
Provisions recorded during the period | 4 | [1]
Provisions reversed during the period | (3) |
Payments during the period | (31) |
Translation differences | 0 |
Balance at the end of the year | $ 49 |
[1] | For additional information, see Note 21 regarding concessions and contingent liabilities.

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- Definition The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount recognised for new other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of provisions other than provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount used (ie incurrent and charged against the provision) for other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount reversed for unused other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_d&doctype=Standard -URIDate 2017-03-09 + Details
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