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Related party transactions - Compensation of Key Management Personnel (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Related Party [Abstract]    
Wages, salaries, fees and related taxes and benefits $ (30) $ (24)
Post-employment benefit plans and OPEBs cost (3) (3)
Share-based compensation (26) (29)
Key management personnel and board of directors compensation expense $ (59) $ (56)