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Assets held for sale - Schedule of Assets and Liabilities Held For Sale (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]      
Trade and other receivables $ 3,949 $ 3,528  
Contract costs 894 764 $ 783
Prepaid expenses 254 209  
Property, plant and equipment 28,235 27,513 27,636
Intangible assets 15,570 13,102 $ 13,352
Other non-current assets 1,306 1,001  
Goodwill 10,572 10,604  
Total assets 66,764 60,665  
Trade payables and other liabilities 4,455 3,935  
Contract liabilities 799 717  
Deferred tax liabilities 4,679 3,810  
Other non-current liabilities 1,003 1,145  
Total liabilities 43,823 $ 39,336  
Assets and liabilities classified as held for sale [member]      
Disclosure of financial assets [line items]      
Trade and other receivables 29    
Contract costs 4    
Prepaid expenses 1    
Property, plant and equipment 2    
Intangible assets 1    
Other non-current assets 7    
Goodwill 6    
Total assets 50    
Trade payables and other liabilities 18    
Contract liabilities 7    
Deferred tax liabilities 5    
Other non-current liabilities 5    
Total liabilities 35    
Total net assets $ 15