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Retirement Benefit Plans - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items] |  |
Surplus(deficit)of plan | $ 134 | $ 44
Expected contribution to defined benefit pension plans for the next annual reporting period | 22 |
Defined contribution expense | $ 47 | 44
Non-Pension Post-Retirement Benefit [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Weighted average duration of the defined benefit obligation | 16 years |
Non-Pension Post-Retirement Benefit [member] | British Columbia [member] | Medical Services Plan Premiums [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Effect from change in financial assumptions | $ 19 | $ 104
Defined Benefit Pension Plans [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Weighted average duration of the defined benefit obligation | 14 years |

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