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provisions (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
provisions |
Schedule of other provisions |
|  | Asset |  |  |  |  |  |  |  |  |  |  |  |
|  | retirement |  | Employee- |  | Written put |  |  |  |  |  |
(millions) |  | obligation |  | related |  | options 1 |  | Other |  | Total
As at January 1, 2017 |  | $ | 339 |  | $ | 77 |  | $ | — |  | $ | 103 |  | $ | 519
Additions |  |  | 13 |  |  | 39 |  |  | 90 |  |  | 58 |  |  | 200
Reversal |  |  | (53) |  |  | (5) |  |  | (11) |  |  | (1) |  |  | (70)
Use |  |  | (6) |  |  | (75) |  |  | — |  |  | (40) |  |  | (121)
Interest effect 2 |  |  | 58 |  |  | — |  |  | 2 |  |  | — |  |  | 60
Effects of foreign exchange, net |  |  | — |  |  | — |  |  | 1 |  |  | — |  |  | 1
As at December 31, 2017 |  |  | 351 |  |  | 36 |  |  | 82 |  |  | 120 |  |  | 589
Additions |  |  | 6 |  |  | 124 |  |  | 207 |  |  | 72 |  |  | 409
Reversal |  |  | — |  |  | — |  |  | (17) |  |  | (5) |  |  | (22)
Use |  |  | (10) |  |  | (72) |  |  | (13) |  |  | (44) |  |  | (139)
Interest effect 2 |  |  | (11) |  |  | — |  |  | 10 |  |  | — |  |  | (1)
Effects of foreign exchange, net |  |  | — |  |  | — |  |  | 21 |  |  | — |  |  | 21
As at December 31, 2018 |  | $ | 336 |  | $ | 88 |  | $ | 290 |  | $ | 143 |  | $ | 857
Current |  | $ | 6 |  | $ | 35 |  | $ | — |  | $ | 37 |  | $ | 78
Non-current |  |  | 345 |  |  | 1 |  |  | 82 |  |  | 83 |  |  | 511
As at December 31, 2017 |  | $ | 351 |  | $ | 36 |  | $ | 82 |  | $ | 120 |  | $ | 589
Current |  | $ | 8 |  | $ | 84 |  | $ | 9 |  | $ | 28 |  | $ | 129
Non-current |  |  | 328 |  |  | 4 |  |  | 281 |  |  | 115 |  |  | 728
As at December 31, 2018 |  | $ | 336 |  | $ | 88 |  | $ | 290 |  | $ | 143 |  | $ | 857
| 1 |  | The additions for the year ended December 31, 2017, for written put options have been adjusted as set out in Note 18(c).
| 2 |  | The difference of $(22) (2017 – $47) between the asset retirement obligation interest effect in this table and the amount included in the amount disclosed in Note 9 is in respect of the change in the discount rates applicable to the provision, such difference being included in the cost of the associated asset(s) by way of being included with (netted against) the additions detailed in Note 17.

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- Definition The disclosure of other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84&doctype=Standard -URIDate 2018-03-16 + Details
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