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Supplemental Disclosure of Cash Flow Information - Supplemental Schedule Of Cash Flow Information (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Statement Of Cash Flows, Additional Disclosures [Abstract] |  |  |
Accounts receivable | $ 368 | $ (441) | $ (850)
Inventory | (219) | (266) | (487)
Prepaids and other | (23) | (20) | 39
Accounts payable | 78 | 537 | 80
Accrued liabilities | (812) | 896 | 525
Current income tax (liabilities) assets | (1,558) | (282) | 1,918
Other long-term liabilities | (200) | (196) | (154)
Net changes in non-cash working capital | (2,366) | 228 | 1,071
Operating activities | (2,417) | 79 | 964
Investing activities | $ 51 | $ 149 | $ 107

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