Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Changes in Outstanding Options and Weighed-Average Exercise Price Per Share) (Details)

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STOCK-BASED COMPENSATION (Changes in Outstanding Options and Weighed-Average Exercise Price Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Shares      
Outstanding at the beginning of the year (in shares) 1,228 1,866 2,579
Granted (all at market price) (in shares) 401 181 189
Exercised (in shares) (398) (779) (888)
Forfeited and canceled (in shares) (47) (40) (14)
Outstanding at the end of the year (in shares) 1,184 1,228 1,866
Vested and expected to vest at end of year (in shares) 1,140    
Exercisable at end of year (in shares) 636 856 1,411
Weighted-Average Exercise Price      
Outstanding at the beginning of the year (in dollars per share) $ 66.81 $ 49.54 $ 42.54
Granted (all at market price) (in dollars per share) 114.66 131.41 97.21
Exercised (in dollars per share) 48.23 40.61 38.74
Forfeited and canceled (in dollars per share) 103.13 72.06 58.24
Outstanding at the end of the year (in dollars per share) 87.64 66.81 49.54
Vested and expected to vest at end of year (in dollars per share) 86.64    
Exercisable at end of year (in dollars per share) $ 62.62 $ 48.43 $ 39.90
Weighted-Average Remaining Contractual Term      
Outstanding at the end of the year 6 years 7 months 7 days    
Vested and expected to vest at end of year 6 years 7 months 7 days    
Exercisable at end of year 4 years 10 months 25 days    
Aggregate Intrinsic Value      
Outstanding at the end of the year $ 40.0    
Vested and expected to vest at end of year 39.5    
Exercisable at end of year $ 35.9