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Other Long-Term Assets - Schedule of other long-term assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]    
North West Redwater Partnership subordinated debt $ 652 $ 591
Prepaid cost of service toll 130 62
Investment in North West Redwater Partnership 0 287
Risk management (note 19) 290 373
Long-term inventory 121 96
Other 84 50
Other assets 1,277 1,459
Less: current portion 54 116
Other long-term assets $ 1,223 $ 1,343