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Risk Management Activities - Credit Risk (Details) - CAD number in Thousands, CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | CAD 40 | CAD 14
Trade and other receivables | 933 | CAD 703
Credit risk |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 2,084 |
Trade and other receivables | CAD 5 |
Credit risk | Trade and other receivables |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 10000.00% |
Credit risk | Long-term portion of finance lease receivables |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 10000.00% |
Maximum exposure to credit risk | CAD 215 |
Credit risk | Risk management assets |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 10000.00% |
Maximum exposure to credit risk | CAD 903 |
Credit risk | Loans and receivables |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 10000.00% |
Maximum exposure to credit risk | CAD 33 |
Credit risk | Investment Grade [Member] | Trade and other receivables |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 8700.00% |
Credit risk | Investment Grade [Member] | Long-term portion of finance lease receivables |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 9600.00% |
Credit risk | Investment Grade [Member] | Risk management assets |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 9900.00% |
Credit risk | Investment Grade [Member] | Loans and receivables |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 0.00% |
Credit risk | Non-Investment Grade [Member] | Trade and other receivables |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 1300.00% |
Credit risk | Non-Investment Grade [Member] | Long-term portion of finance lease receivables |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 400.00% |
Credit risk | Non-Investment Grade [Member] | Risk management assets |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 100.00% |
Credit risk | Non-Investment Grade [Member] | Loans and receivables |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 10000.00% |
Trade and other receivables | Credit risk |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | CAD 933 |

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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35K_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_36_a&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The amount of current trade receivables and current other receivables. [Refer: Current trade receivables; Other current receivables] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_h&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 b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_b&doctype=Standard -URIDate 2017-03-09 + Details
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