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Financial Instruments - Maturity Dates for Financial Liabilities (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items] |  |  |
Accounts payable | $ 1,418 | $ 1,341 |
Accrued liabilities | 3,534 | 4,209 |
Long-term debt | 10,799 | 11,445 |
Other long-term liabilities | 8,686 | 8,161 |
Interest and other financing expense | 691 | 670 | $ 743
Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 10,859 | $ 11,514 |
Less than 1 year | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 980 |  |
Less than 1 year | Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Accounts payable | 1,418 |  |
Accrued liabilities | 3,534 |  |
Other long-term liabilities | 302 |  |
Lease payments included In liablities | 298 |  |
Less than 1 year | Liquidity risk | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 980 |  |
Interest and other financing expense | 582 |  |
1 to less than 2 years | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 1,584 |  |
1 to less than 2 years | Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Other long-term liabilities | 184 |  |
Lease payments included In liablities | 184 |  |
1 to less than 2 years | Liquidity risk | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 1,584 |  |
Interest and other financing expense | 518 |  |
2 to less than 5 years | Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Other long-term liabilities | 428 |  |
Lease payments included In liablities | 428 |  |
2 to less than 5 years | Liquidity risk | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 2,317 |  |
Interest and other financing expense | 1,257 |  |
Thereafter | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 5,978 |  |
Thereafter | Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Other long-term liabilities | 645 |  |
Lease payments included In liablities | 645 |  |
Thereafter | Liquidity risk | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 5,978 |  |
Interest and other financing expense | $ 3,362 |  |

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