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STOCK OWNERSHIP AND COMPENSATION PLANS (Transactions Under Stock Option Plans) (Details) - Equity Option - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Options outstanding, beginning of year 8.0    
Options granted 1.1    
Exercise of stock options, shares (2.6)    
Options outstanding, end of year 6.5 8.0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Options outstanding, beginning of year weighted average exercise price $ 81.67    
Options, granted weighted average exercise price 112.23    
Options exercised weighted average exercise price 72.57    
Options outstanding, end of year weighted average exercise price $ 90.32 $ 81.67  
Options outstanding, end of year weighted average remaining contractual term 6 years 8 months 12 days    
Options outstanding, end of year aggregate intrinsic value $ 187    
Exercisable, end of year shares 3.9    
Exercisable, end of year weighted average exercise price $ 83.72    
Exercisable, end of year weighted average remaining contractual term 5 years 7 months 6 days    
Exercisable, end of year aggregate intrinsic value $ 138    
Vested and expected to vest, end of year shares 6.4    
Vested and expected to vest, end of year weighted average exercise price $ 90.14    
Vested and expected to vest, end of year weighted average remaining contractual term 6 years 8 months 12 days    
Vested and expected to vest, end of year aggregate intrinsic value $ 185    
Total intrinsic value of options exercised 113 $ 62 $ 67
Compensation not yet recognized, stock options $ 9    
Unrecognized stock-based compensation cost weighted average period 1 year 7 months 6 days