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long-term debt - TELUS Corporation credit facility (Details)
$ in Millions, $ in Millions
Dec. 31, 2018
USD ($)
item
Dec. 31, 2018
CAD ($)
item
Dec. 31, 2017
CAD ($)
TELUS Corporation credit facility      
Net available   $ 1,476 $ 1,110
Gross available   2,250 2,250
Long-term debt   14,101 13,660
Maximum letter of credit required to participate in wireless spectrum auction   $ 880  
TELUS Corporation credit facility      
TELUS Corporation credit facility      
Number of financial ratio tests | item 2 2  
Gross available   $ 2,250  
Letters of credit outstanding   $ 184 224
TELUS Corporation credit facility | Maximum      
TELUS Corporation credit facility      
Net debt to operating cash flow ratio 4.00 4.00  
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 $ 569 $ 774 $ 1,140