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Per Share Amounts - Additional Information (Detail) - CAD ($) $ / shares in Units, shares in Thousands, $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 14, 2024 | Jan. 02, 2024 | Jan. 03, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Total dividends paid on preferred shares |  |  |  | $ 36 | $ 35
Net settlement rights |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Instruments excluded from calculation, shares (in shares) |  |  |  | 1,500 | 52
Common Shares |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Instruments excluded from calculation, value |  |  |  | $ 0 | $ 52
Instruments excluded from calculation, shares (in shares) |  |  |  | 0 | 1,600
Preference shares |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Total dividends paid on preferred shares |  | $ 9 | $ 9 | $ 36 | $ 26
Preference shares | Potential ordinary share transactions |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Dividends declared (in CAD per share) | $ 0.140 |  |  |  |
Dividends declared | $ 9 |  |  |  |

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