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Risk Management Activities - Credit Risk (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | $ 5 | $ 13
Trade and other receivables | 462 | $ 756
Credit risk |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | $ 1,491 |
Credit risk | Trade and other receivables |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 100.00% |
Credit risk | Long-term portion of finance lease receivable |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 100.00% |
Maximum exposure to credit risk | $ 176 |
Credit risk | Risk management assets |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 100.00% |
Maximum exposure to credit risk | $ 806 |
Credit risk | Amortized cost |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 100.00% |
Maximum exposure to credit risk | $ 47 |
Credit risk | Investment Grade [Member] | Trade and other receivables |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 85.00% |
Credit risk | Investment Grade [Member] | Long-term portion of finance lease receivable |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 100.00% |
Credit risk | Investment Grade [Member] | Risk management assets |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 99.00% |
Credit risk | Investment Grade [Member] | Amortized cost |  |
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 | 15.00% |
Credit risk | Non-Investment Grade [Member] | Long-term portion of finance lease receivable |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 0.00% |
Credit risk | Non-Investment Grade [Member] | Risk management assets |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 1.00% |
Credit risk | Non-Investment Grade [Member] | Amortized cost |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 100.00% |
Trade and other receivables | Credit risk |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | $ 462 |

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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 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35K_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -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 2018-03-16 + 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 2018-01-01 -Paragraph 54 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_h&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 b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_b&doctype=Standard -URIDate 2018-03-16 + Details
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