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Risk Management Activities - Net Risk Management Assets and Liabilities (Details) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financial Liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | $ (385) | $ (592)
Commodity risk management | Current risk management liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (178) | (414)
Commodity risk management | Long-term risk management liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (226) | (172)
Commodity risk management | Financial Liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (404) | (586)
Other | Current risk management liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | (6)
Other | Long-term risk management liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | 0
Other | Financial Liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | (6)
Current | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | 15 |
Long-term | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | 4 |
Financial Assets | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | 19 |
Cash flow hedges | Cash flow hedges | Financial Liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (205) | (347)
Cash flow hedges | Cash flow hedges | Commodity risk management | Current risk management liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (125) | (271)
Cash flow hedges | Cash flow hedges | Commodity risk management | Long-term risk management liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (80) | (76)
Cash flow hedges | Cash flow hedges | Commodity risk management | Financial Liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (205) | (347)
Cash flow hedges | Cash flow hedges | Other | Current risk management liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | 0
Cash flow hedges | Cash flow hedges | Other | Long-term risk management liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | 0
Cash flow hedges | Cash flow hedges | Other | Financial Liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | 0
Cash flow hedges | Current | Cash flow hedges | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | 0 |
Cash flow hedges | Long-term | Cash flow hedges | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | 0 |
Cash flow hedges | Financial Assets | Cash flow hedges | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | 0 |
Not designated as a hedge | Financial Liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (180) | (245)
Not designated as a hedge | Commodity risk management | Current risk management liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (53) | (143)
Not designated as a hedge | Commodity risk management | Long-term risk management liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (146) | (96)
Not designated as a hedge | Commodity risk management | Financial Liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (199) | (239)
Not designated as a hedge | Other | Current risk management liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | (6)
Not designated as a hedge | Other | Long-term risk management liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | 0
Not designated as a hedge | Other | Financial Liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | $ (6)
Not designated as a hedge | Current | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | 15 |
Not designated as a hedge | Long-term | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | 4 |
Not designated as a hedge | Financial Assets | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | $ 19 |

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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 2023-01-01 -Paragraph B8 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_B8_c&doctype=Appendix&subtype=B -URIDate 2023-03-23 + Details
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