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Investments - Summarized financial information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of subsidiaries [line items]        
Revenues $ 2,101 $ 2,347 $ 2,249  
Depreciation and amortization 654 590 574  
Net interest expense (238) (179) (250)  
Net earnings (loss) (253) 176 (90)  
Other comprehensive income (102) (45) 4  
Total comprehensive income (loss) (355) 131 (86)  
Current liabilities (935) (1,117)    
Assets 9,747 9,508    
Cash and cash equivalents 703 $ 411 $ 89 $ 314
SP Skookumchuck Investment, LLC        
Disclosure of subsidiaries [line items]        
Revenues 6      
Depreciation and amortization 2      
Net interest expense 1      
Net earnings (loss) 3      
Other comprehensive income 0      
Total comprehensive income (loss) 3      
Current assets 6      
Long-term assets 382      
Current liabilities (65)      
Long-term liabilities (150)      
Assets 173      
Cash and cash equivalents 1      
Current financial liabilities (27)      
Non-current financial liabilities $ (147)