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Provisions (Details) - CAD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of changes in other provisions [abstract] |  |  |
Other provisions, beginning balance | $ 312 |  |
Additions | 60 |  |
Usage | (32) |  |
Reversals | (30) |  |
Acquired through business combinations | 18 |  |
Other provisions, ending balance | 328 |  |
Current |  | $ 55 | $ 39
Non-current |  | 273 | 273
Total other provisions | 312 | 328 | 312
Asset retirement obligations (AROs) |  |  |
Reconciliation of changes in other provisions [abstract] |  |  |
Other provisions, beginning balance | 175 |  |
Additions | 14 |  |
Usage | (2) |  |
Reversals | (18) |  |
Acquired through business combinations | 1 |  |
Other provisions, ending balance | 170 |  |
Current |  | 11 |
Non-current |  | 159 |
Total other provisions | 175 | 170 | 175
Other |  |  |
Reconciliation of changes in other provisions [abstract] |  |  |
Other provisions, beginning balance | 137 |  |
Additions | 46 |  |
Usage | (30) |  |
Reversals | (12) |  |
Acquired through business combinations | 17 |  |
Other provisions, ending balance | 158 |  |
Current |  | 44 |
Non-current |  | 114 |
Total other provisions | $ 137 | $ 158 | $ 137

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- Definition The increase in other provisions resulting from acquisitions through business combinations. [Refer: Business combinations [member]; 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 of additional other provisions made. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 increase (decrease) in 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 -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 of non-current provisions other than provisions for employee benefits. [Refer: Non-current provisions] + References Reference 1: 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 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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