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EARNINGS PER COMMON SHARE - ADDITIONAL INFORMATION (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]        
Antidilutive common stock options not included in the computation of diluted earnings per common share (in shares) 2.5 4.4 3.4 5.1