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per share amounts (Details) - TELUS Corporation share options
shares in Millions
12 Months Ended
Dec. 31, 2019
EquityInstruments
shares
Dec. 31, 2018
EquityInstruments
shares
Dec. 31, 2017
EquityInstruments
earnings per share amounts      
Outstanding share awards excluded in the calculation of diluted net income per Common Share | shares 0 0  
Number of options outstanding | EquityInstruments 0 326,164 740,471