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Capital Disclosure of cash flow statement (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of classes of share capital [line items]      
Cash flows from (used in) operating activities $ 849 $ 820 $ 626
Increase (decrease) in cash flow from (used in) operating activities 29    
Change in non-cash operating working capital balances (121) 44 114
Increase (decrease) in non cash working capital (165)    
Cash flow from operations before changes in working capital 728 864 740
Increase (decrease) in cash flow from operations before changes in working capital (136)    
Distributions paid to subsidiaries’ non-controlling interests 106 165 172
Increase (decrease) in dividends paid to non controlling interests 59    
Property, plant and equipment expenditures 417 277 338
Increase (decrease) in property, plant and equipment expenditure (140)    
Net inflows (outflows) of cash 120 336  
Increase (decrease) in net inflows (outflows) of cash (216)    
Common shares      
Disclosure of classes of share capital [line items]      
Dividends paid 45 46 46
Increase (decrease) in dividends paid 1    
Preferred shares      
Disclosure of classes of share capital [line items]      
Dividends paid 40 $ 40 $ 40
Increase (decrease) in dividends paid $ 0