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Net Other Operating (Income) Losses Analysis of income and expenses (Details) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Analysis of income and expenses [Line Items] |  |  |  |
Alberta Off-Coal Agreement | CAD (40) |  | CAD 0 | CAD 0
Mississauga cogeneration facility NUG Contract | (9) | CAD (191) | 0 |
Market Surveillance Administrator Agreement settlement | 0 | 0 | 56 |
Insurance recoveries | 0 | (3) | (31) |
Net other operating (income) losses | CAD (49) | CAD (194) | CAD 25 |

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- Definition The amount of income recognised from the reimbursement of a claim as a result of the occurrence of an insured event covered by an insurance contract. [Refer: Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The losses on settlements of litigation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_f&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of operating income (expense) that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition [Line Items] for Analysis of income and expenses [Table] + References No definition available. + Details
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- Definition Gains (Losses) on Contract Agreement + References No definition available. + Details
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- Definition Gains (Losses) on Contract Restructuring + References No definition available. + Details
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