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provisions (Details) - CAD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
provisions reconciliation |  |  |  |
Balance at beginning of period | $ 589 | $ 519 |  |
Additions | 409 | 200 |  |
Reversal | (22) | (70) |  |
Use | (139) | (121) |  |
Interest effect | (1) | 60 |  |
Effects of foreign exchange, net | 21 | 1 |  |
Balance at end of period | 857 | 589 |  |
Current |  |  | $ 129 | $ 78
Non-current |  |  | 728 | 511
Total | 589 | 519 | 857 | 589
Differences of interest effect due to change in discount rates as compared to interest accretion on provisions | (22) | 47 |  |
Asset retirement obligation |  |  |  |
provisions reconciliation |  |  |  |
Balance at beginning of period | 351 | 339 |  |
Additions | 6 | 13 |  |
Reversal |  | (53) |  |
Use | (10) | (6) |  |
Interest effect | (11) | 58 |  |
Balance at end of period | 336 | 351 |  |
Current |  |  | 8 | 6
Non-current |  |  | 328 | 345
Total | 351 | 339 | 336 | 351
Employee related |  |  |  |
provisions reconciliation |  |  |  |
Balance at beginning of period | 36 | 77 |  |
Additions | 124 | 39 |  |
Reversal |  | (5) |  |
Use | (72) | (75) |  |
Balance at end of period | 88 | 36 |  |
Current |  |  | 84 | 35
Non-current |  |  | 4 | 1
Total | 36 | 77 | 88 | 36
Written put options |  |  |  |
provisions reconciliation |  |  |  |
Balance at beginning of period | 82 |  |  |
Additions | 207 | 90 |  |
Reversal | (17) | (11) |  |
Use | (13) |  |  |
Interest effect | 10 | 2 |  |
Effects of foreign exchange, net | 21 | 1 |  |
Balance at end of period | 290 | 82 |  |
Current |  |  | 9 |
Non-current |  |  | 281 | 82
Total | 82 | 82 | 290 | 82
Other |  |  |  |
provisions reconciliation |  |  |  |
Balance at beginning of period | 120 | 103 |  |
Additions | 72 | 58 |  |
Reversal | (5) | (1) |  |
Use | (44) | (40) |  |
Balance at end of period | 143 | 120 |  |
Current |  |  | 28 | 37
Non-current |  |  | 115 | 83
Total | $ 120 | $ 103 | $ 143 | $ 120

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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 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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- 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 2018-01-01 -Paragraph 84 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_b&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 84 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_d&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 84 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_c&doctype=Standard -URIDate 2018-03-16 + Details
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- References No definition available. + 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 2018-01-01 -Paragraph 84 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in other provisions resulting from interest effect. + References No definition available. + Details
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- Definition The difference between the interest effect on other provisions and the interest accretion on provisions included in financing costs due to the change in the discount rates applicable to the provision. + References No definition available. + Details
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- Definition The amount of current provisions other than provisions for employee benefits. + References No definition available. + Details
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- Definition The amount of non-current provisions other than provisions for employee benefits. + References No definition available. + Details
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