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STOCK-BASED COMPENSATION. (Stock Options) (Details)
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding at December 31, 2017 (in shares) | shares 15,221,123
Exercised (in shares) | shares (1,492,576)
Forfeited (in shares) | shares (24,538)
Expired (in shares) | shares (14,364)
Outstanding at March 31, 2018 (in shares) | shares 13,689,645
Exercisable at March 31, 2018 (in shares) | shares 9,635,926
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Weighted-average exercise price of options outstanding at December 31, 2017 (in dollars per share) | $ / shares $ 66.98
Weighted-average exercise price of options exercised (in dollars per share) | $ / shares 59.69
Weighted-average exercise price of options forfeited (in dollars per share) | $ / shares 75.74
Weighted-average exercise price of options expired (in dollars per share) | $ / shares 71.15
Weighted-average exercise price of options outstanding at March 31, 2018 (in dollars per share) | $ / shares 67.76
Weighted-average exercise price of options exercisable at March 31, 2018 (in dollars per share) | $ / shares $ 64.42