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Capital Disclosure of cash flow statement (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of classes of share capital [line items]      
Cash flows from (used in) operating activities $ 1,001 $ 702 $ 849
Increase (decrease) in cash flow from (used in) operating activities 299    
Change in non-cash operating working capital balances (174) (89) (121)
Increase (decrease) in non cash working capital (85)    
Cash flow from operations before changes in working capital 827 613 728
Increase (decrease) in cash flow from operations before changes in working capital 214    
Distributions paid to subsidiaries’ non-controlling interests 156 97 106
Increase (decrease) in dividends paid to non controlling interests (59)    
Property, plant and equipment expenditures 480 486 417
Increase (decrease) in property, plant and equipment expenditure 6    
Net inflows (outflows) of cash 104 (56)  
Increase (decrease) in net inflows (outflows) of cash 160    
Credit facilities | Committed credit facilities      
Disclosure of classes of share capital [line items]      
Undrawn borrowing capacity under line of credit 1,300 1,500  
Common shares      
Disclosure of classes of share capital [line items]      
Dividends paid 48 47 45
Increase (decrease) in dividends paid (1)    
Preferred shares      
Disclosure of classes of share capital [line items]      
Dividends paid 39 $ 39 $ 40
Increase (decrease) in dividends paid $ 0