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Per Share Amounts - Common Share Dividends (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Earnings per share [abstract]    
Dividends paid (in CAD per share) $ 0.680 $ 0.525
Dividends paid on common shares $ 1,255 $ 990
Variable dividends declared (in CAD per share) $ 0.135 $ 0
Variable Dividends Declared on Common Shares $ 251 $ 0
Total common share dividends paid (in CAD per share) $ 0.815 $ 0.525
Total dividends paid on common shares $ 1,506 $ 990