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share-based compensation - Restricted stock units (Details) - EquityInstruments
12 Months Ended
Dec. 31, 2017
Jun. 30, 2018
Mar. 31, 2018
TELUS Corporation restricted stock units      
share-based compensation      
Outstanding 3,945,273 5,811,161  
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 154,452 230,562  
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 463,357 691,686  
Restricted stock units with only service conditions      
share-based compensation      
Outstanding 3,327,464 4,888,913  
Restricted stock units without market performance conditions      
share-based compensation      
Outstanding 3,481,916 5,119,475 5,063,888