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Debt (Maturities) (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Capital leases    
2019 $ 9  
2020 15  
2021 5  
2022 0  
2023 0  
2024 and thereafter 0  
Total 29  
Debt    
2019 1,175  
2020 400  
2021 787  
2022 333  
2023 197  
2024 and thereafter 9,648  
Total 12,540  
Total    
2019 1,184  
2020 415  
2021 792  
2022 333  
2023 197  
2024 and thereafter 9,648  
Total $ 12,569 $ 10,828