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per share amounts (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Effect of dilutive securities        
Basic total weighted average number of Common Shares outstanding [1] 1,278 1,203 1,263 1,202
Effect of dilutive securities - Restricted share units 2   1  
Diluted total weighted average number of Common Shares outstanding 1,280 1,203 1,264 1,202
Restricted share units        
Effect of dilutive securities        
Outstanding share awards excluded in the calculation of diluted net income per Common Share 0   0  
Share option awards        
Effect of dilutive securities        
Outstanding share awards excluded in the calculation of diluted net income per Common Share 0   2  
[1] Amounts reflect retrospective application of March 17, 2020, share split (see Note 28(b)).