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Pensions and Other Post-Employment Benefits - Summary of Fair Value of the Plan Assets (Detail) - CAD ($) $ in Millions | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Disclosure of defined benefit plans [line items] |  |  |
Equity Funds | $ 77 |  | $ 58
Fixed Income Funds | 54 |  | 35
Real Estate Funds | 9 |  | 6
Listed Infrastructure Funds | 8 |  | 8
Emerging Market Debt Funds | 8 |  | 7
Cash and Cash Equivalents | 2 |  | 2
Non-Invested Assets | 1 |  | 1
Total fair value | $ 159 |  | $ 117
United States |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Total fair value |  | $ 32 |

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