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Risk Management Activities - Net Risk Management Assets and Liabilities (Details) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financial Liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | $ (592) |
Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | $ 293
Commodity risk management | Financial Liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (586) |
Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | 8
Other | Financial Liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (6) |
Current | Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (414) | 45
Current | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (6) | 2
Long-term | Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (172) | 248
Long-term | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | 0 | 6
Financial Assets |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | 301
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 | (347) |
Cash flow hedges | Cash flow hedges | Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | 285
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 | (347) |
Cash flow hedges | Cash flow hedges | Other |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | 3
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 | Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (271) | 33
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 | 3
Cash flow hedges | Long-term | Cash flow hedges | Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities | (76) | 252
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 | 0
Cash flow hedges | Financial Assets | Cash flow hedges |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | 288
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 | (245) |
Not designated as a hedge | Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | 8
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 | (96) | (4)
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 | (143) |
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 | (239) |
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 |  | 6
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 |  | (1)
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) | 5
Not designated as a hedge | Current | Commodity risk management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | 12
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 | (6) |
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 | $ 0 |
Not designated as a hedge | Financial Assets |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Commodity risk management assets and liabilities |  | $ 13

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