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Per Share Amounts - Common Share Dividends (Details) - Common shares - CAD ($)
$ / shares in Units, $ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Earnings per share [line items]    
Dividends paid (in CAD per share) $ 0.385 $ 0.245
Dividends paid on common shares $ 729 $ 481
Variable dividends declared ( in CAD per share) $ 0 $ 0
Variable dividends paid on common shares $ 0 $ 0
Total common share dividends paid (in CAD per share) $ 0.385 $ 0.245
Total dividends paid on common shares $ 729 $ 481