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Asset and Goodwill Impairment Testing - Summary of Pre-tax Impairment Reversal and (Asset Impairments) Recorded in Statement of Income (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Impairment reversal and (asset impairments) | $ (41) | $ 163
Steelmaking coal CGU [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Impairment reversal |  | 207
Other [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Asset impairments | $ (41) | $ (44)

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