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EARNINGS PER COMMON SHARE (Tables)
9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of weighted average shares outstanding used to calculate basic and diluted earnings per common share
Weighted average shares outstanding used to calculate basic and diluted earnings per share are as follows:
 
Three months ended
September 30,
 
Nine months ended
September 30,
 
2018

2017

 
2018

2017

(number of common shares in millions)
 

 

 
 

 

Weighted average shares outstanding
1,705

1,635

 
1,695

1,482

Effect of dilutive options
3

7

 
4

8

Diluted weighted average shares outstanding
1,708

1,642


1,699

1,490