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share-based compensation - Restricted stock units (Details)
12 Months Ended
Dec. 31, 2018
EquityInstruments
shares
Dec. 31, 2017
EquityInstruments
Dec. 31, 2016
EquityInstruments
Restricted stock units      
share-based compensation      
Nominal value (in number of equity shares) | shares 1    
Typical vesting period 33 months    
TELUS Corporation restricted stock units      
share-based compensation      
Outstanding 3,660,437 3,945,273  
Restricted stock units with performance condition | Maximum      
share-based compensation      
Variable payout (as a percent) 200.00%    
Restricted stock units with performance condition | Minimum      
share-based compensation      
Variable payout (as a percent) 0.00%    
Restricted stock units with total customer connections performance condition      
share-based compensation      
Total customer connection payout weight (as a per cent) 25.00%    
Outstanding 155,639 154,452  
Restricted stock units with relative total shareholder return performance condition      
share-based compensation      
Relative total shareholder return payout weight (as a per cent) 75.00%    
Outstanding 466,917 463,357  
Restricted stock units with only service conditions      
share-based compensation      
Outstanding 3,037,881 3,327,464  
Restricted stock units without market performance conditions      
share-based compensation      
Outstanding 3,193,520 3,481,916 3,390,979