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Financial Instruments - Maturity Dates for Financial Liabilities (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items] |  |  |
Accounts payable | $ 1,079 | $ 1,418 |
Accrued liabilities | 4,525 | 3,534 |
Long-term debt | 18,819 | 10,799 |
Other long-term liabilities | 9,302 | 8,686 |
Interest and other financing expense | 673 | 691 | $ 670
Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 18,909 | $ 10,859 |
Less than 1 year | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 2,400 |  |
Less than 1 year | Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Accounts payable | 1,079 |  |
Accrued liabilities | 4,525 |  |
Other long-term liabilities | 263 |  |
Lease payments included In liablities | 255 |  |
Less than 1 year | Liquidity risk | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 2,400 |  |
Interest and other financing expense | 1,024 |  |
1 to less than 2 years | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 941 |  |
1 to less than 2 years | Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Other long-term liabilities | 187 |  |
Lease payments included In liablities | 187 |  |
1 to less than 2 years | Liquidity risk | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 941 |  |
Interest and other financing expense | 951 |  |
2 to less than 5 years | Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Other long-term liabilities | 405 |  |
Lease payments included In liablities | 405 |  |
2 to less than 5 years | Liquidity risk | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 7,494 |  |
Interest and other financing expense | 1,978 |  |
Thereafter | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 8,074 |  |
Thereafter | Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Other long-term liabilities | 617 |  |
Lease payments included In liablities | 617 |  |
Thereafter | Liquidity risk | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 8,074 |  |
Interest and other financing expense | $ 3,574 |  |

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