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Post-employment benefit plans - Defined Benefit Plans Recognized in Comprehensive Income (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Employee Benefits [Abstract]    
Cumulative gains (losses) recognized directly in equity, January 1 $ 419 $ (2,014)
Actuarial gains in other comprehensive income from continuing operations 894 3,020
Increase in the effect of the asset limit in other comprehensive income from continuing operations (328) (587)
Cumulative gains recognized directly in equity, December 31 985 $ 419
Cumulative actuarial losses 1,699  
Cumulative decrease in the effect of the asset limit $ (714)