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Risk Management Activities - Netting Arrangements (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Current risk management liabilities |  |
Disclosure of financial liabilities [abstract] |  |
Gross amounts of recognized financial liabilities | $ (662) | $ (504)
Amounts set off | 421 | 355
Net amounts included on the statement of financial position | (241) | (149)
Master netting arrangements | 18 | 7
Net amount | (223) | (142)
Long-term risk management liabilities |  |
Disclosure of financial liabilities [abstract] |  |
Gross amounts of recognized financial liabilities | (128) | (145)
Amounts set off | 59 | 91
Net amounts included on the statement of financial position | (69) | (54)
Master netting arrangements | 1 | 2
Net amount | (68) | (52)
Accounts payable, accrued liabilities and other current liabilities(5) |  |
Disclosure of financial liabilities [abstract] |  |
Gross amounts of recognized financial liabilities | (1,470) | (760)
Amounts set off | 1,273 | 646
Net amounts included on the statement of financial position | (197) | (114)
Master netting arrangements | 7 | 11
Net amount | (190) | (103)
Current risk management assets |  |
Disclosure of financial assets [abstract] |  |
Gross amounts of recognized financial assets | 686 | 528
Amounts set off | (421) | (355)
Net amounts included on the statement of financial position | 265 | 173
Master netting arrangements | (18) | (7)
Net amount | 247 | 166
Long-term risk management assets |  |
Disclosure of financial assets [abstract] |  |
Gross amounts of recognized financial assets | 153 | 161
Amounts set off | (59) | (91)
Net amounts included on the statement of financial position | 94 | 70
Master netting arrangements | (1) | (2)
Net amount | 93 | 68
Trade and other receivables(2) |  |
Disclosure of financial assets [abstract] |  |
Gross amounts of recognized financial assets | 1,519 | 789
Amounts set off | (1,273) | (646)
Net amounts included on the statement of financial position | 246 | 143
Master netting arrangements | (7) | (11)
Net amount | $ 239 | $ 132

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