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Other Long-Term Assets - Schedule of other long-term assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Oct. 06, 2020
Dec. 31, 2019
Disclosure of detailed information about business combination [line items]      
North West Redwater Partnership subordinated debt $ 555   $ 652
Prepaid cost of service toll 162   130
Risk management 136   290
Long-term inventory 121   121
Other 190   84
Other assets 1,164   1,277
Less: current portion 82   54
Other long-term assets $ 1,082   $ 1,223
Painted Pony Energy Ltd      
Disclosure of detailed information about business combination [line items]      
Contract assets   $ 111