EMPLOYEE STOCK BENEFIT PLANS - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (shares)	1,783	1,724	1,959	1,902
Granted (shares)	431	463	485
Exercised (shares)	(272)	(652)	(377)
Forfeited or expired (shares)	(100)	(46)	(51)
Vested shares (shares)	1,010
Vested and expected to vest (shares)	1,767
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance (dollars per share)	$ 75.73	$ 67.01	$ 60.12	$ 52.11
Granted, weighted average exercise price (dollars per share)	102.47	82.31	74.76
Exercised, weighted average exercise price (dollars per share)	59.54	56.79	36.06
Forfeited or expired, weighted average exercise price (dollars per share)	84.74	$ 72.55	$ 73.57
Vested shares, weighted average exercise price (dollars per share)	63.53
Vested and expected to vest, weighted average exercise price (dollars per share)	$ 75.54
Beginning balance (years)	7 years	7 years 3 months 24 days	7 years 4 months 26 days	7 years 8 months 15 days
Vested shares, average remaining contractual term	5 years 9 months
Vested and expected to vest, average remaining contractual term	7 years
Beginning balance	$ 16.6	$ 57.8	$ 46.3	$ 99.2
Exercised shares, aggregate intrinsic value	9.5	$ 23.5	$ 17.6
Vested shares, aggregate intrinsic value	16.1
Vested and expected to vest, aggregate intrinsic value	$ 16.6