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Long Term Debt - Carrying Value of Long-Term Debt Instruments (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 CAD ($) | Dec. 31, 2024 $ / shares | Dec. 31, 2023 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt | $ 6,629 |  | $ 6,071
3.050% Senior notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings, interest rate | 3.05% |  |
Issue date | Aug. 27, 2020 |  |
Maturity date | Aug. 27, 2060 |  |
Debt instrument, par value | $ / shares |  | $ 1,155 |
Long-term debt | $ 1,659 |  | 1,519
5.375% Senior notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings, interest rate | 5.375% |  |
Issue date | Mar. 04, 2016 |  |
Maturity date | Mar. 04, 2046 |  |
Debt instrument, par value | $ / shares |  | 750 |
Long-term debt | $ 1,067 |  | 977
Debt instrument basis points | 0.40% |  |
3.703% Senior notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings, interest rate | 3.703% |  |
Issue date | Mar. 16, 2022 |  |
Maturity date | Mar. 16, 2032 |  |
Debt instrument, par value | $ / shares |  | 750 |
Long-term debt | $ 1,074 |  | 983
Debt instrument basis points | 0.25% |  |
2.396% Senior notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings, interest rate | 2.396% |  |
Issue date | Jun. 01, 2020 |  |
Maturity date | Jun. 01, 2027 |  |
Debt instrument, par value | $ / shares |  | 200 |
Long-term debt | $ 287 |  | 263
Debt instrument basis points | 0.30% |  |
2.484% Senior notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings, interest rate | 2.484% |  |
Issue date | May 19, 2020 |  |
Maturity date | May 19, 2027 |  |
Debt instrument, par value | $ / shares |  | 500 |
Long-term debt | $ 717 |  | 657
Debt instrument basis points | 0.30% |  |
3.527% Senior notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings, interest rate | 3.527% |  |
Issue date | Dec. 02, 2016 |  |
Maturity date | Dec. 02, 2026 |  |
Debt instrument, par value | $ / shares |  | 270 |
Long-term debt | $ 388 |  | 356
Debt instrument basis points | 0.20% |  |
4.150% Senior notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings, interest rate | 4.15% |  |
Issue date | Mar. 04, 2016 |  |
Maturity date | Mar. 04, 2026 |  |
Debt instrument, par value | $ / shares |  | $ 1,000 |
Long-term debt | $ 1,437 |  | $ 1,316
Debt instrument basis points | 0.35% |  |

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