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dividends per share (Details) - CAD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Aug. 04, 2022
Oct. 01, 2019
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Dividends per share                
Dividends per share $ 0.3386   $ 0.3386 $ 0.3274 $ 0.3162 $ 0.3112 $ 0.6660 $ 0.6274
Dividends Declared     $ 467 $ 450 $ 428 $ 404 $ 917 $ 832
Dividend reinvestment and share purchase plan                
Dividends per share                
Maximum discount on common shares (as a percent)             5.00%  
Offering price discount on Common Shares from Treasury (as a percent)   2.00%            
Dividend reinvestment in Common Shares       $ 158 $ 146   $ 307 $ 289