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long-term debt (Details)
$ in Millions, $ in Millions
Jun. 30, 2020
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CAD ($)
Jun. 30, 2019
CAD ($)
Details of long-term debt        
Long-term debt excluding Lease liabilities $ 16,797   $ 16,813  
Lease liabilities 1,721   1,661  
Long-term debt 18,518   18,474 $ 16,579
Current liabilities 562   1,332  
Non-current 17,956   17,142  
TELUS Corporation senior notes        
Details of long-term debt        
Long-term debt excluding Lease liabilities 14,729   14,479  
TELUS Corporation commercial paper        
Details of long-term debt        
Long-term debt excluding Lease liabilities     1,015  
Long-term debt   $ 781 1,015  
TELUS Communications Inc. debentures        
Details of long-term debt        
Long-term debt excluding Lease liabilities 622   621  
TELUS International (Cda) Inc. credit facility        
Details of long-term debt        
Long-term debt excluding Lease liabilities 1,167   431  
Other        
Details of long-term debt        
Long-term debt excluding Lease liabilities $ 279   $ 267