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real estate joint ventures - Commitments and contingent liabilities (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
CAD ($)
item
Dec. 31, 2017
CAD ($)
real estate joint venture    
Advances $ 14,101 $ 13,660
Real estate joint ventures    
real estate joint venture    
Construction financing amount 342 342
Real estate joint ventures | TELUS Corporation Construction Credit Facility    
real estate joint venture    
Construction financing amount 114 114
Undrawn 45 67
Advances 69 47
Real estate joint ventures | Construction Credit Facility - Other    
real estate joint venture    
Construction financing amount 228 228
TELUS Sky real estate joint venture    
real estate joint venture    
Real estate joint venture approximate total capital spending 400  
Contractual capital commitments $ 35 $ 82
Percentage of financing provided 33.333%  
Construction financing amount $ 342  
TELUS Sky real estate joint venture | Three Canadian financial institutions    
real estate joint venture    
Number of Canadian financial institution lenders | item 3  
Percentage of financing provided 66.667%