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share-based compensation - Restricted share units (Details)
12 Months Ended
Dec. 31, 2019
EquityInstruments
shares
Dec. 31, 2018
EquityInstruments
Dec. 31, 2017
EquityInstruments
Restricted share units      
share-based compensation      
Nominal value (in number of equity shares) | shares 1    
Typical vesting period 33 months    
TELUS Corporation restricted share units      
share-based compensation      
Outstanding 3,657,626 3,660,437  
Restricted share units with performance condition | Maximum      
share-based compensation      
Variable payout (as a percent) 200.00%    
Restricted share units with performance condition | Minimum      
share-based compensation      
Variable payout (as a percent) 0.00%    
Restricted share units with total customer connections performance condition      
share-based compensation      
Total customer connection payout weight (as a per cent) 25.00%    
Outstanding 141,050 155,639  
Restricted share units with relative total shareholder return performance condition      
share-based compensation      
Relative total shareholder return payout weight (as a per cent) 75.00%    
Outstanding 423,149 466,917  
Restricted share units with only service conditions      
share-based compensation      
Outstanding 3,093,427 3,037,881  
Restricted share units without market performance conditions      
share-based compensation      
Outstanding 3,234,477 3,193,520 3,481,916