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Long-Term Debt - Carrying Value of Long Term Debt Instruments (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CAD ($) | Jan. 01, 2022 CAD ($)
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Long-term debt | $ 6,071 |  | $ 6,234 | $ 4,882
3.050% Senior notes [Member] |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Issue date | Aug. 27, 2020 |  |  |
Maturity date | Aug. 27, 2060 |  |  |
Par value |  | $ 1,155 |  |
Long-term debt | $ 1,519 |  | 1,559 |
5.375% Senior notes [Member] |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Issue date | Mar. 04, 2016 |  |  |
Maturity date | Mar. 04, 2046 |  |  |
Par value |  | 750 |  |
Long-term debt | $ 977 |  | 1,004 |
3.703% Senior notes [Member] |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Issue date | Mar. 16, 2022 |  |  |
Maturity date | Mar. 16, 2032 |  |  |
Par value |  | 750 |  |
Long-term debt | $ 983 |  | 1,011 |
2.396% Senior notes [Member] |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Issue date | Jun. 01, 2020 |  |  |
Maturity date | Jun. 01, 2027 |  |  |
Par value |  | 200 |  |
Long-term debt | $ 263 |  | 270 |
2.484% Senior notes [Member] |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Issue date | May 19, 2020 |  |  |
Maturity date | May 19, 2027 |  |  |
Par value |  | 500 |  |
Long-term debt | $ 657 |  | 674 |
3.527% Senior notes [Member] |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Issue date | Dec. 02, 2016 |  |  |
Maturity date | Dec. 02, 2026 |  |  |
Par value |  | 270 |  |
Long-term debt | $ 356 |  | 365 |
4.150% Senior notes [Member] |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Issue date | Mar. 04, 2016 |  |  |
Maturity date | Mar. 04, 2026 |  |  |
Par value |  | $ 1,000 |  |
Long-term debt | $ 1,316 |  | $ 1,351 |

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