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Provisions (Tables) | 12 Months Ended
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Dec. 31, 2017
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] |
Disclosure of other provisions |
FOR THE YEAR ENDED DECEMBER 31 | NOTE | Asset retirement obligations (AROs) |  | Other (1) |  | Total |
January 1, 2017 |  | 175 |  | 137 |  | 312 |
Additions |  | 14 |  | 46 |  | 60 |
Usage |  | (2 | ) | (30 | ) | (32 | )
Reversals |  | (18 | ) | (12 | ) | (30 | )
Acquired through business combinations |  | 1 |  | 17 |  | 18 |
December 31, 2017 |  | 170 |  | 158 |  | 328 |
Current | 18 | 11 |  | 44 |  | 55 |
Non-current | 23 | 159 |  | 114 |  | 273 |
December 31, 2017 |  | 170 |  | 158 |  | 328 |
(1) Other includes environmental, legal, regulatory and vacant space provisions.

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