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Provisions and Other Liabilities - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($)
Disclosure of other provisions [line items] |  |
Other provisions | $ 4,023 | $ 3,657
Other environment related provision |  |
Disclosure of other provisions [line items] |  |
Provisions | 73 | 101
Provision for decommissioning, restoration and rehabilitation costs |  |
Disclosure of other provisions [line items] |  |
Other provisions | 3,725 | 3,342
Water quality management costs |  |
Disclosure of other provisions [line items] |  |
Other provisions | $ 1,300 | 1,200
Extended period | 100 years |
Provision for decommissioning, restoration and rehabilitation costs, closed operations |  |
Disclosure of other provisions [line items] |  |
Other provisions | $ 721 | 712
Steelmaking Coal | Water quality management costs |  |
Disclosure of other provisions [line items] |  |
Other provisions | $ 769 | $ 673
Discount rate | Bottom of range | Provision for decommissioning, restoration and rehabilitation costs |  |
Disclosure of other provisions [line items] |  |
Nominal discount rate | 0.0386 | 0.0405
Discount rate | Top of range | Provision for decommissioning, restoration and rehabilitation costs |  |
Disclosure of other provisions [line items] |  |
Nominal discount rate | 0.0535 | 0.0585
Inflation rate | Provision for decommissioning, restoration and rehabilitation costs |  |
Disclosure of other provisions [line items] |  |
Nominal discount rate | 0.0200 | 0.0200

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