NET EARNINGS PER SHARE - Schedule of Earnings per Share, Basic and Diluted (Details) - shares shares in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Weighted average number of outstanding shares - basic	754,556	753,085	718,560
Dilutive potential common shares	2,271	3,581	3,841
Weighted average number of outstanding common shares - diluted	756,827	756,666	722,401
Stock options
Dilutive potential common shares	1,310	2,571	2,672
Restricted stock units
Dilutive potential common shares	566	582	756
Performance share units
Dilutive potential common shares	395	428	413

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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