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QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2024
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
Q1Q2Q3Q4Total
(unaudited; millions of Canadian dollars, except per share amounts)
2024
Operating revenues
11,038 11,336 14,882 16,217 53,473 
Operating income
2,711 2,273 2,218 2,447 9,649 
Earnings
1,565 2,001 1,447 618 5,631 
Earnings attributable to controlling interests
1,512 1,943 1,391 595 5,441 
Earnings attributable to common shareholders
1,419 1,848 1,293 493 5,053 
Earnings per common share
Basic0.67 0.86 0.59 0.23 2.34 
Diluted0.67 0.86 0.59 0.23 2.34 
2023
Operating revenues
12,075 10,432 9,844 11,298 43,649 
Operating income
2,662 2,350 1,794 1,845 8,651 
Earnings
1,866 2,001 623 1,568 6,058 
Earnings attributable to controlling interests
1,817 1,935 621 1,818 6,191 
Earnings attributable to common shareholders
1,733 1,848 532 1,726 5,839 
Earnings per common share
Basic0.86 0.91 0.26 0.81 2.84 
Diluted0.85 0.91 0.26 0.81 2.84