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, 2018
Dec. 31, 2017
Dec. 31, 2016
Shares      
Outstanding at the beginning of the year (in shares) 1,184 1,228 1,866
Granted (all at market price) (in shares) 553 401 181
Exercised (in shares) (212) (398) (779)
Forfeited and canceled (in shares) (63) (47) (40)
Outstanding at the end of the year (in shares) 1,462 1,184 1,228
Vested and expected to vest at end of year (in shares) 1,415    
Exercisable at end of year (in shares) 631 636 856
Weighted-Average Exercise Price      
Outstanding at the beginning of the year (in dollars per share) $ 87.64 $ 66.81 $ 49.54
Granted (all at market price) (in dollars per share) 122.35 114.66 131.41
Exercised (in dollars per share) 60.55 48.23 40.61
Forfeited and canceled (in dollars per share) 114.67 103.13 72.06
Outstanding at the end of the year (in dollars per share) 103.50 87.64 66.81
Vested and expected to vest at end of year (in dollars per share) 103.01    
Exercisable at end of year (in dollars per share) $ 80.81 $ 62.62 $ 48.43
Weighted-Average Remaining Contractual Term      
Outstanding at the end of the year 7 years 3 months    
Vested and expected to vest at end of year 7 years 2 months    
Exercisable at end of year 5 years 2 months    
Aggregate Intrinsic Value      
Outstanding at the end of the year $ 14.0    
Vested and expected to vest at end of year 13.9    
Exercisable at end of year $ 14.0