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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, 2016
CAD
Pension Plans, Defined Benefit [Member]  
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
2017 CAD 616
2018 626
2019 634
2020 641
2021 649
2022 - 2026 3,315
Other Postretirement Benefit Plans, Defined Benefit [Member]  
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
2017 33
2018 32
2019 32
2020 31
2021 31
2022 - 2026 CAD 147