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Provisions and Other Liabilities - Additional Information (Detail) $ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($)
Disclosure of other provisions [line items] |  |  |  |
Other provisions |  |  | $ 3,657 | $ 2,470
Provision for decommissioning, restoration and rehabilitation costs, period increase (decrease) | $ 712 | $ 412 |  |
Other environment related provision |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions |  |  | 101 | 78
Provision for decommissioning, restoration and rehabilitation costs |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Other provisions |  |  | 3,342 | 2,234
Water quality management costs |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Other provisions |  |  | $ 1,200 | 745
Extended period |  |  | 100 years |
Provision for decommissioning, restoration and rehabilitation costs, closed operations |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Other provisions |  |  | $ 712 | 396
Steelmaking Coal | Water quality management costs |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Other provisions |  |  | $ 673 | $ 411
Discount rate | Bottom of range | Provision for decommissioning, restoration and rehabilitation costs |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Nominal discount rate |  |  | 0.0405 |
Discount rate | Top of range | Provision for decommissioning, restoration and rehabilitation costs |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Nominal discount rate |  |  | 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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