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Financial Instruments and Risk Management (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Net Liabilities in Relation to its Equity | This table shows comparisons of the Company’s net liabilities and its Equity on December 31, 2017 and 2016:
|  | 2017 |  |  | 2016 |
Total liabilities |  |  | 27,910 |  |  |  | 29,102 |
(–) Cash and cash equivalents |  |  | (1,030 | ) |  |  | (995 | )
(–) Restricted cash |  |  | (106 | ) |  |  | (367 | )
Net liabilities |  |  | 26,774 |  |  |  | 27,740 |
Total equity |  |  | 14,330 |  |  |  | 12,934 |
Net liabilities / equity |  |  | 1.87 |  |  |  | 2.14 |

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