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Pensions and Other Benefits - Summary of Estimated Future Pension and Other Post-retirement Benefit Payments (Detail)
CAD in Millions
Dec. 31, 2017
CAD
Pension Plans, Defined Benefit [Member]  
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
2018 CAD 609
2019 614
2020 620
2021 625
2022 631
2023 – 2027 3,220
Other Postretirement Benefit Plans, Defined Benefit [Member]  
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
2018 33
2019 31
2020 31
2021 31
2022 30
2023 – 2027 CAD 146