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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - CAD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Quarterly Financial Information Disclosure [Abstract]                      
Operating revenues $ 16,217 $ 14,882 $ 11,336 $ 11,038 $ 11,298 $ 9,844 $ 10,432 $ 12,075 $ 53,473 $ 43,649 $ 53,309
Operating income 2,447 2,218 2,273 2,711 1,845 1,794 2,350 2,662 9,649 8,651 5,178
Earnings 618 1,447 2,001 1,565 1,568 623 2,001 1,866 5,631 6,058 2,938
Earnings attributable to controlling interests 595 1,391 1,943 1,512 1,818 621 1,935 1,817 5,441 6,191 3,003
Earnings attributable to common shareholders $ 493 $ 1,293 $ 1,848 $ 1,419 $ 1,726 $ 532 $ 1,848 $ 1,733 $ 5,053 $ 5,839 $ 2,589
Earnings per common share                      
Basic (in CAD per share) $ 0.23 $ 0.59 $ 0.86 $ 0.67 $ 0.81 $ 0.26 $ 0.91 $ 0.86 $ 2.34 $ 2.84 $ 1.28
Diluted (in CAD per share) $ 0.23 $ 0.59 $ 0.86 $ 0.67 $ 0.81 $ 0.26 $ 0.91 $ 0.85 $ 2.34 $ 2.84 $ 1.28