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share-based compensation - Restricted share units (Details)
12 Months Ended
Dec. 31, 2021
EquityInstruments
shares
Dec. 31, 2020
EquityInstruments
Dec. 31, 2019
EquityInstruments
share-based compensation      
Outstanding 0 0  
Restricted share units      
share-based compensation      
Nominal value (in number of equity shares) | shares 1    
TELUS Corporation restricted share units      
share-based compensation      
Typical vesting period 33 months    
Outstanding 6,949,418 6,914,155  
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 366,983 298,957  
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 1,100,949 896,870  
Restricted share units with only service conditions      
share-based compensation      
Outstanding 5,481,486 5,718,328  
Restricted share units without market performance conditions      
share-based compensation      
Outstanding 5,848,469 6,017,285 6,468,954
TELUS International (Cda) Inc restricted share units      
share-based compensation      
Typical vesting period 48 months    
TELUS International (Cda) Inc restricted share units | Maximum      
share-based compensation      
Variable payout (as a percent) 150.00%    
TELUS International (Cda) Inc restricted share units | Minimum      
share-based compensation      
Variable payout (as a percent) 0.00%    
TELUS International (Cda) Inc. Restricted Share Units US Dollar Denominated      
share-based compensation      
Outstanding 1,850,807 1,383,642 2,093,603