TREASURY STOCK (Details) (USD $)	1 Months Ended	3 Months Ended					12 Months Ended
	Oct. 31, 2013	Dec. 31, 2014	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 05, 2015
Subsequent Event [Line Items]
Stock repurchase program, authorized amount					$ 1,000,000,000
Repurchase of common stock, excluding repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation (in shares)		438,897	114,645	484,361	431,910	263,913
Repurchase of common stock, excluding repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation		500,000,000	147,300,000	459,200,000	345,500,000	166,200,000
Remaining authorization of repurchase common stock		7,200,000					7,200,000
Reacquired shares, settlement of conversion spread hedges (in shares)	42,160
Reacquired shares, settlement of conversion spread hedges, value	43,100,000							19,000
Repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation (in shares)							77,761	113,503	141,229
Repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation							103,100,000	78,800,000	90,800,000
Treasury stock, shares		9,888,024					9,888,024	9,256,721
Subsequent Event
Subsequent Event [Line Items]
Stock repurchase program, authorized amount										$ 3,000,000,000