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share-based compensation - Restricted share units (Details) - EquityInstruments
6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
TELUS Corporation restricted share units      
share-based compensation      
Outstanding 10,730,373   7,315,252
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 449,850   282,100
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 1,349,549   846,298
Restricted share units with only service conditions      
share-based compensation      
Outstanding 8,930,974   6,186,854
Restricted share units without market performance conditions      
share-based compensation      
Outstanding 9,380,824 9,060,044 6,468,954