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Financial Instruments - Foreign Currency Exchange Rate Risk Management (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Cash proceeds from settlement of cash flow hedge | $ 2 | $ 4 | $ 15 |  |
6.25% due March 15, 2038 (US$1,100 million) |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount |  |  |  | $ 1,100,000,000 | $ 1,100,000,000
Cross currency swaps | Cash flow hedges | Currency risk |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Cash proceeds from settlement of cash flow hedge |  | $ 158 |  |  |
Cross currency swaps | Currency swap contract, term through March 2038 | Cash flow hedges | Currency risk |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Nominal amount of hedging instrument |  |  |  |  | 550,000,000
Average foreign exchange rate |  | 0.0625 |  |  |
Foreign currency forward contracts | Currency risk |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount |  |  |  | $ 1,003,000,000 | $ 1,017,000,000
Derivative, term of contract | 90 days |  |  |  |

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