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long-term debt (Details)
$ in Millions, $ in Millions
Jun. 30, 2018
USD ($)
Jun. 30, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Jan. 01, 2017
CAD ($)
Details of long-term debt        
Long-term debt   $ 14,145 $ 13,660  
Current   1,009 1,404 $ 1,327
Non-current   13,136 12,256 $ 11,604
TELUS Corporation notes        
Details of long-term debt        
Long-term debt   13,090 11,561  
TELUS Corporation commercial paper        
Details of long-term debt        
Long-term debt $ 2 3 1,140  
TELUS Communications Inc. debentures        
Details of long-term debt        
Long-term debt   620 620  
TELUS International (Cda) Inc. credit facility        
Details of long-term debt        
Long-term debt   $ 432 $ 339