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long-term debt - TELUS Corporation credit facility (Details)
$ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
item
Dec. 31, 2020
CAD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CAD ($)
TELUS Corporation credit facility        
Net available   $ 1,519   $ 1,235
Gross available   2,250   2,250
Long-term debt   $ 20,288   18,474
TELUS Corporation credit facility        
TELUS Corporation credit facility        
Number of financial ratio tests | item 2 2    
Gross available   $ 2,250   2,250
Letters of credit outstanding   $ 190   184
TELUS Corporation credit facility | Maximum        
TELUS Corporation credit facility        
Leverage ratio 4.25 4.25    
TELUS Corporation credit facility | Minimum        
TELUS Corporation credit facility        
Operating cash flow to interest expense ratio 2.00 2.00    
TELUS Corporation commercial paper        
TELUS Corporation credit facility        
Gross available   $ 1,400   1,400
Long-term debt $ 574 $ 731 $ 781 $ 1,015