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STOCK-BASED COMPENSATION - Stock Option Exercises, Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award      
Treasury stock, Shares (in shares) 1,307,249,588 1,279,249,412  
Additional stock options outstanding in connection with acquisitions (in shares) 300,000    
Additional options outstanding, weighted-average exercise price (in dollars per share) $ 42    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award      
Total intrinsic value of options exercised $ 7 $ 20 $ 74
Cash received from employees as a result of employee stock option exercises 11 33 119
Tax benefit from exercise of stock based awards $ 2 $ 7 $ 26