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Risk Management Activities - Maximum exposure to credit risk (Details) - CAD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of credit risk exposure [line items]
Maximum exposure to credit risk	$ 22	$ 5
Credit risk
Disclosure of credit risk exposure [line items]
Maximum exposure to credit risk	1,555
Credit risk | Trade and other receivables
Disclosure of credit risk exposure [line items]
Maximum exposure to credit risk	$ 583
Trade and other receivables | Credit risk
Disclosure of credit risk exposure [line items]
Credit risk, allocation percentage	100.00%
Trade and other receivables | Investment Grade [Member] | Credit risk
Disclosure of credit risk exposure [line items]
Credit risk, allocation percentage	92.00%
Trade and other receivables | Non-Investment Grade [Member] | Credit risk
Disclosure of credit risk exposure [line items]
Credit risk, allocation percentage	8.00%
Long-term portion of finance lease receivable | Credit risk
Disclosure of credit risk exposure [line items]
Credit risk, allocation percentage	100.00%
Maximum exposure to credit risk	$ 228
Long-term portion of finance lease receivable | Investment Grade [Member] | Credit risk
Disclosure of credit risk exposure [line items]
Credit risk, allocation percentage	100.00%
Long-term portion of finance lease receivable | Non-Investment Grade [Member] | Credit risk
Disclosure of credit risk exposure [line items]
Credit risk, allocation percentage	0.00%
Risk management assets | Credit risk
Disclosure of credit risk exposure [line items]
Credit risk, allocation percentage	100.00%
Maximum exposure to credit risk	$ 692
Risk management assets | Investment Grade [Member] | Credit risk
Disclosure of credit risk exposure [line items]
Credit risk, allocation percentage	93.00%
Risk management assets | Non-Investment Grade [Member] | Credit risk
Disclosure of credit risk exposure [line items]
Credit risk, allocation percentage	7.00%
Amortized cost | Credit risk
Disclosure of credit risk exposure [line items]
Credit risk, allocation percentage	100.00%
Maximum exposure to credit risk	$ 52
Amortized cost | Investment Grade [Member] | Credit risk
Disclosure of credit risk exposure [line items]
Credit risk, allocation percentage	0.00%
Amortized cost | Non-Investment Grade [Member] | Credit risk
Disclosure of credit risk exposure [line items]
Credit risk, allocation percentage	100.00%

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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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 2019-01-01
-Paragraph 35K
-Subparagraph a
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-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 36
-Subparagraph a
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Credit Risk, Allocation Percentage

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