v3.26.1
dividends per share (Details) - CAD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jul. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Dividends per share              
Dividends per share $ 0.1875 $ 0.4184 $ 0.4184 $ 0.4163 $ 0.4023 $ 0.8368 $ 0.8186
Dividends declared   $ 659 $ 653 $ 634 $ 610 $ 1,312 $ 1,244
Dividend reinvestment and share purchase plan              
Dividends per share              
Maximum discount on common shares (as a percent)           5.00%  
Dividend reinvestment in common shares   $ 201   $ 212   $ 405 $ 403