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Risk Management Activities - Net Risk Management Assets and Liabilities (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic |  | $ 542
Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic |  | (12)
Current | Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 45 | 90
Current | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 2 | (13)
Long-term | Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 248 | 452
Long-term | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 6 | 1
Financial Assets |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 301 | 530
Financial Assets | Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 293 |
Financial Assets | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 8 |
Designated as a hedge | Cash flow hedges | Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic |  | 572
Designated as a hedge | Cash flow hedges | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic |  | (9)
Designated as a hedge | Current | Cash flow hedges | Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 33 | 101
Designated as a hedge | Current | Cash flow hedges | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 3 | (9)
Designated as a hedge | Long-term | Cash flow hedges | Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 252 | 471
Designated as a hedge | Long-term | Cash flow hedges | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 0 | 0
Designated as a hedge | Financial Assets | Cash flow hedges |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 288 | 563
Designated as a hedge | Financial Assets | Cash flow hedges | Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 285 |
Designated as a hedge | Financial Assets | Cash flow hedges | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 3 |
Not designated as a hedge | Financial Liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 13 |
Not designated as a hedge | Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic |  | (30)
Not designated as a hedge | Commodity risk management | Long-term |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | (4) | (19)
Not designated as a hedge | Commodity risk management | Current |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 12 |
Not designated as a hedge | Commodity risk management | Financial Liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 8 |
Not designated as a hedge | Other | Long-term |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic |  | 1
Not designated as a hedge | Other | Current |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic |  | (4)
Not designated as a hedge | Other | Financial Liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic |  | (3)
Not designated as a hedge | Current | Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic |  | (11)
Not designated as a hedge | Current | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | (1) |
Not designated as a hedge | Long-term | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | 6 |
Not designated as a hedge | Financial Assets |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic |  | $ (33)
Not designated as a hedge | Financial Assets | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instruments sharing characteristic | $ 5 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of risk exposure associated with financial instruments with a shared characteristic that identifies a concentration of risks. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph B8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_B8_c&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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