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INCOME PER COMMON SHARE (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Schedule of reconciliations of the numerators and denominators used in the computations of basic and diluted earnings per common share
Reconciliations of the numerators and denominators used in the computations of basic and diluted earnings per common share were as follows, in millions:
 202020192018
Numerator (basic and diluted):
Income from continuing operations$810 $639 $636 
Less: Allocation to unvested restricted stock awards
Income from continuing operations attributable to common shareholders          
804 635 630 
Income from discontinued operations, net414 296 98 
Less: Allocation to unvested restricted stock awards
Income from discontinued operations, net attributable to common shareholders
411 294 97 
Net income attributable to common shareholders$1,215 $929 $727 
Denominator:
Basic common shares (based upon weighted average)264 287 305 
Add: Stock option dilution— 
Diluted common shares264 288 307