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Per Share Amounts - Common Share Dividends (Details) - Common shares - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Earnings per share [line items]      
Dividends paid (in CAD per share) $ 0.350 $ 0.088 $ 0.063
Dividends paid on common shares $ 682 $ 176 $ 77
Variable dividends declared (in CAD per share) $ 0.114 $ 0 $ 0
Variable dividends paid on common shares $ 219 $ 0 $ 0
Total common share dividends paid (in CAD per share) $ 0.464 $ 0.088 $ 0.063
Total dividends paid on common shares $ 901 $ 176 $ 77