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Capital - Disclosure of Cash Flow Statement (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of classes of share capital [line items]      
Cash flow from operating activities $ 877 $ 1,001 $ 702
Increase (decrease) in cash flow from operating activities (124)    
Change in non-cash working capital 316 (174) (89)
Increase (decrease) in change in non-cash working capital 490    
Cash flow from operations before changes in working capital 1,193 827 613
Increase (decrease) in cash flow from operations before changes in working capital 366    
Distributions paid to subsidiaries’ non-controlling interests 187 156 97
Increase (decrease) in dividends paid to non controlling interests (31)    
Property, plant and equipment expenditures 918 480 486
Increase (decrease) in property, plant and equipment expenditure (438)    
Net inflows (outflows) of cash (9) 104  
Increase (decrease) in net inflows (outflows) of cash (113)    
Committed syndicated bank facility | Committed credit facilities      
Disclosure of classes of share capital [line items]      
Undrawn borrowing capacity 1,000 1,300  
Common shares      
Disclosure of classes of share capital [line items]      
Dividends paid 54 48 47
Increase (decrease) in dividends paid (6)    
Preferred shares      
Disclosure of classes of share capital [line items]      
Dividends paid 43 $ 39 $ 39
Increase (decrease) in dividends paid $ (4)