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Post-employee benefit plans - Defined Benefit Plans Recognized in Comprehensive Income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Employee Benefits [Abstract]    
Cumulative losses recognized directly in equity, January 1 $ (2,701) $ (2,892)
Actuarial gains in other comprehensive income from continuing operations 732 191
Increase in the effect of the asset limit in other comprehensive income from continuing operations (45) 0
Cumulative losses recognized directly in equity, December 31 (2,014) $ (2,701)
Cumulative actuarial losses 2,215  
Cumulative decrease in the effect of the asset limit $ 201