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Capital Disclosure of cash flow statement (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of classes of share capital [line items]      
Cash flows from (used in) operating activities $ 702 $ 849 $ 820
Increase (decrease) in cash flow from (used in) operating activities (147)    
Change in non-cash operating working capital balances (89) (121) 44
Increase (decrease) in non cash working capital 32    
Cash flow from operations before changes in working capital 613 728 864
Increase (decrease) in cash flow from operations before changes in working capital (115)    
Distributions paid to subsidiaries’ non-controlling interests 97 106 165
Increase (decrease) in dividends paid to non controlling interests 9    
Property, plant and equipment expenditures 486 417 277
Increase (decrease) in property, plant and equipment expenditure (69)    
Net inflows (outflows) of cash (56) 120  
Increase (decrease) in net inflows (outflows) of cash (176)    
Credit facilities | Committed credit facilities      
Disclosure of classes of share capital [line items]      
Undrawn borrowing capacity under line of credit 1,500 1,300  
Common shares      
Disclosure of classes of share capital [line items]      
Dividends paid 47 45 46
Increase (decrease) in dividends paid (2)    
Preferred shares      
Disclosure of classes of share capital [line items]      
Dividends paid 39 $ 40 $ 40
Increase (decrease) in dividends paid $ 1