DEBT (Revolving Credit Facility and Outstanding Debt) (Details)				1 Months Ended		3 Months Ended		12 Months Ended
	Jun. 19, 2015 USD ($)	Aug. 20, 2014 USD ($) Days $ / shares	Oct. 31, 2011 USD ($)	May 31, 2013 USD ($) Days $ / shares	Mar. 31, 2012 USD ($) $ / shares	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)	Aug. 15, 2017 USD ($)	Mar. 10, 2017 EUR (€)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 USD ($)	May 23, 2016 USD ($)	Nov. 25, 2015 EUR (€)	Mar. 13, 2015 USD ($)	Mar. 03, 2015 EUR (€)	Sep. 23, 2014 EUR (€)	Jun. 30, 2013 USD ($)	Mar. 31, 2010 USD ($) $ / shares
Debt Instrument
Line of Credit Facility, term (in years)	5 years		5 years
Letters of Credit Outstanding, Amount																$ 3,800,000				$ 3,800,000
Write off of Deferred Debt Issuance Cost								$ 400,000
Outstanding Principal Amount																9,003,000,000				6,400,563,000
Unamortized Debt Discount and Debt Issuance Cost																(193,212,000)				(230,041,000)
Long-term Debt																8,809,788,000				6,170,522,000
Reclassification of unamortized debt discount from additional paid-in-capital to convertible debt in mezzanine																2,963,000				28,538,000
Payments Related to Conversion of Senior Notes								285,718,000	$ 0	$ 147,629,000
Loss on early extinguishment of debt								2,366,000	0	3,000
Amortization of debt discount								69,734,000	68,974,000	66,687,000
Convertible Notes
Debt Instrument
Interest Expense, Debt								93,700,000	94,500,000	92,700,000
Debt Instrument, Coupon Interest Expense								21,300,000	22,500,000	22,600,000
Amortization of debt discount								67,700,000	67,500,000	65,600,000
Amortization of debt issuance costs included in interest expense								$ 4,700,000	$ 4,500,000	$ 4,500,000
Weighted-average effective interest rate during the period								3.40%	3.40%	3.40%
Convertible Debt 1.25 Percent Due March 2015
Debt Instrument
Payments of debt issuance costs														$ 13,300,000
Interest rate stated percentage (as a percent)																											1.25%
Senior notes face amount																											$ 575,000,000
Debt Instrument, Convertible, Conversion Price | $ / shares																											$ 303.06
Cash repayment of principal amount of convertible debt							$ 37,500,000
Cash payment of the conversion value in excess of the principal amount							$ 110,100,000
1.00% Convertible Senior Notes Due March 2018
Debt Instrument
Payments of debt issuance costs													$ 20,900,000
Outstanding Principal Amount																714,304,000				1,000,000,000
Unamortized Debt Discount and Debt Issuance Cost																(3,394,000)				(32,266,000)
Short-term Debt																$ 710,910,000				$ 967,734,000
Interest rate stated percentage (as a percent)					1.00%										1.00%	1.00%			1.00%	1.00%
Reclassification of unamortized debt discount from additional paid-in-capital to convertible debt in mezzanine																$ 3,000,000				$ 28,500,000
Payments Related to Conversion of Senior Notes								$ 285,700,000
Conversion of debt (in shares) | shares								149,780
Loss on early extinguishment of debt								$ (2,400,000)
Loss on early extinguishment of debt, Net of Tax								(1,500,000)
Senior notes face amount					$ 1,000,000,000
Debt Instrument, Convertible, Conversion Price | $ / shares					$ 944.61
Debt Instrument, Interest Rate, Effective Percentage					3.50%
Debt discount related to convertible notes, net of tax					$ 80,900,000
Debt discount related to convertible notes, before tax					135,200,000
Finance costs related to convertible notes, net of tax					2,800,000
0.35% Senior Convertible Notes Due June 2020
Debt Instrument
Payments of debt issuance costs												$ 1,000,000
Outstanding Principal Amount																1,000,000,000				1,000,000,000
Unamortized Debt Discount and Debt Issuance Cost																(64,825,000)				(90,251,000)
Long-term Debt																$ 935,175,000				$ 909,749,000
Interest rate stated percentage (as a percent)				0.35%											0.35%	0.35%			0.35%	0.35%
Senior notes face amount				$ 1,000,000,000
Unamortized Debt Discount				$ 20,000,000
Debt Instrument, Convertible, Conversion Price | $ / shares				$ 1,315.10
Ratio of closing share price to conversion price as a condition for conversion of convertible 2015 Senior Notes, minimum (as a percent)				150.00%
Debt Instrument, Interest Rate, Effective Percentage				3.13%
Debt discount related to convertible notes, net of tax																										$ 92,400,000
Debt discount related to convertible notes, before tax																										154,300,000
Finance costs related to convertible notes, net of tax																										$ 100,000
Amortization of debt discount								2,900,000	$ 2,800,000	$ 2,700,000
0.9% Senior Convertible Notes Due September 2021
Debt Instrument
Payments of debt issuance costs											$ 11,000,000
Outstanding Principal Amount																$ 1,000,000,000				$ 1,000,000,000
Unamortized Debt Discount and Debt Issuance Cost																(83,272,000)				(104,592,000)
Long-term Debt																$ 916,728,000				$ 895,408,000
Interest rate stated percentage (as a percent)		0.90%													0.90%	0.90%			0.90%	0.90%
Senior notes face amount		$ 1,000,000,000
Debt Instrument, Convertible, Conversion Price | $ / shares		$ 2,055.50
Ratio of closing share price to conversion price as a condition for conversion of convertible 2015 Senior Notes, minimum (as a percent)		150.00%
Debt Instrument, Interest Rate, Effective Percentage		3.18%
Debt discount related to convertible notes, net of tax											82,500,000
Debt discount related to convertible notes, before tax											142,900,000
Finance costs related to convertible notes, net of tax											1,600,000
0.8% Senior Notes Due March 2022
Debt Instrument
Payments of debt issuance costs								5,000,000
Outstanding Principal Amount																$ 1,200,800,000
Unamortized Debt Discount and Debt Issuance Cost																(6,238,000)
Long-term Debt																$ 1,194,562,000
Interest rate stated percentage (as a percent)															0.80%	0.80%		0.80%
Senior notes face amount | €															€ 1,000,000,000			€ 1,000,000,000
Unamortized Debt Discount | €																		€ 2,100,000
Debt Instrument, Interest Rate, Effective Percentage																		0.84%
2.15% Senior Notes Due November 2022
Debt Instrument
Payments of debt issuance costs										3,700,000
Outstanding Principal Amount																$ 900,600,000				$ 791,063,000
Unamortized Debt Discount and Debt Issuance Cost																(4,683,000)				(5,336,000)
Long-term Debt																$ 895,917,000				$ 785,727,000
Interest rate stated percentage (as a percent)															2.15%	2.15%			2.15%	2.15%		2.15%
Senior notes face amount | €															€ 750,000,000				€ 750,000,000			€ 750,000,000
Unamortized Debt Discount | €																						€ 2,200,000.0
Debt Instrument, Interest Rate, Effective Percentage																							2.20%
2.75% Senior Notes Due March 2023
Debt Instrument
Payments of debt issuance costs								2,700,000
Outstanding Principal Amount																$ 500,000,000
Unamortized Debt Discount and Debt Issuance Cost																(3,203,000)
Long-term Debt																$ 496,797,000
Interest rate stated percentage (as a percent)															2.75%	2.75%	2.75%
Senior notes face amount																	$ 500,000,000
Unamortized Debt Discount																	$ 700,000
Debt Instrument, Interest Rate, Effective Percentage																	2.78%
2.375% Senior Notes Due September 2024
Debt Instrument
Payments of debt issuance costs											$ 6,500,000
Outstanding Principal Amount																$ 1,200,800,000				$ 1,054,750,000
Unamortized Debt Discount and Debt Issuance Cost																(12,240,000)				(12,861,000)
Long-term Debt																$ 1,188,560,000				$ 1,041,889,000
Interest rate stated percentage (as a percent)															2.375%	2.375%			2.375%	2.375%					2.375%
Senior notes face amount | €															€ 1,000,000,000				€ 1,000,000,000						€ 1,000,000,000
Unamortized Debt Discount | €																									€ 9,400,000
Debt Instrument, Interest Rate, Effective Percentage																									2.48%
3.65% Senior Notes Due March 2025
Debt Instrument
Payments of debt issuance costs										3,200,000
Outstanding Principal Amount																$ 500,000,000				$ 500,000,000
Unamortized Debt Discount and Debt Issuance Cost																(3,290,000)				(3,727,000)
Long-term Debt																$ 496,710,000				$ 496,273,000
Interest rate stated percentage (as a percent)															3.65%	3.65%			3.65%	3.65%			3.65%
Senior notes face amount																							$ 500,000,000
Unamortized Debt Discount																							$ 1,300,000.0
Debt Instrument, Interest Rate, Effective Percentage																							3.68%
3.6% Senior Notes Due June 2026
Debt Instrument
Payments of debt issuance costs									$ 6,200,000
Outstanding Principal Amount																$ 1,000,000,000				$ 1,000,000,000
Unamortized Debt Discount and Debt Issuance Cost																(6,840,000)				(7,619,000)
Long-term Debt																$ 993,160,000				$ 992,381,000
Interest rate stated percentage (as a percent)															3.60%	3.60%			3.60%	3.60%	3.60%
Senior notes face amount																					$ 1,000,000,000
Unamortized Debt Discount																					$ 1,900,000
Debt Instrument, Interest Rate, Effective Percentage																					3.62%
1.8% Senior Notes Due March 2027
Debt Instrument
Payments of debt issuance costs										6,300,000
Outstanding Principal Amount																$ 1,200,800,000				$ 1,054,750,000
Unamortized Debt Discount and Debt Issuance Cost																(5,136,000)				(5,655,000)
Long-term Debt																$ 1,195,664,000				$ 1,049,095,000
Interest rate stated percentage (as a percent)															1.80%	1.80%			1.80%	1.80%				1.80%
Senior notes face amount | €															€ 1,000,000,000				€ 1,000,000,000					€ 1,000,000,000
Unamortized Debt Discount | €																								€ 300,000.0
Debt Instrument, Interest Rate, Effective Percentage																								1.80%
3.55% Senior Notes Due March 2028
Debt Instrument
Payments of debt issuance costs								$ 3,200,000
Outstanding Principal Amount																$ 500,000,000
Unamortized Debt Discount and Debt Issuance Cost																(3,485,000)
Long-term Debt																$ 496,515,000
Interest rate stated percentage (as a percent)															3.55%	3.55%	3.55%
Senior notes face amount																	$ 500,000,000
Unamortized Debt Discount																	$ 400,000
Debt Instrument, Interest Rate, Effective Percentage																	3.56%
Minimum | 1.00% Convertible Senior Notes Due March 2018
Debt Instrument
Additional Payment To Debt Holder Settled In Shares Aggregate Value Of Shares					0
Minimum | 0.35% Senior Convertible Notes Due June 2020
Debt Instrument
Debt Instrument, Convertible, Threshold Consecutive Trading Days | Days				20
Additional Payment To Debt Holder Settled In Shares Aggregate Value Of Shares				$ 0
Minimum | 0.9% Senior Convertible Notes Due September 2021
Debt Instrument
Debt Instrument, Convertible, Threshold Consecutive Trading Days | Days		20
Additional Payment To Debt Holder Settled In Shares Aggregate Value Of Shares		$ 0
Maximum | 1.00% Convertible Senior Notes Due March 2018
Debt Instrument
Additional Payment To Debt Holder Settled In Shares Aggregate Value Of Shares					$ 344,000,000
Maximum | 0.35% Senior Convertible Notes Due June 2020
Debt Instrument
Debt Instrument, Convertible, Threshold Consecutive Trading Days | Days				30
Additional Payment To Debt Holder Settled In Shares Aggregate Value Of Shares				$ 397,000,000
Maximum | 0.9% Senior Convertible Notes Due September 2021
Debt Instrument
Debt Instrument, Convertible, Threshold Consecutive Trading Days | Days		30
Additional Payment To Debt Holder Settled In Shares Aggregate Value Of Shares		$ 375,000,000
Revolving Credit Facility
Debt Instrument
Revolving credit facility maximum borrowing capacity	$ 2,000,000,000		$ 1,000,000,000
Payments of debt issuance costs										$ 4,000,000.0
Borrowings outstanding under the revolving credit facility																$ 0				$ 0
Write off of Deferred Debt Issuance Cost						$ 1,000,000
Revolving Credit Facility | Minimum
Debt Instrument
Revolving credit facility commitment fee percentage on undrawn balances	0.085%
Revolving Credit Facility | Maximum
Debt Instrument
Revolving credit facility commitment fee percentage on undrawn balances	0.20%
Revolving Credit Facility | Rate 2C | Minimum
Debt Instrument
Revolving credit facility interest rate	0.00%
Revolving Credit Facility | Rate 2C | Maximum
Debt Instrument
Revolving credit facility interest rate	0.50%
Letter of Credit
Debt Instrument
Revolving credit facility maximum borrowing capacity	$ 70,000,000
Swingline Loans
Debt Instrument
Revolving credit facility maximum borrowing capacity	$ 50,000,000.0
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Rate 1 | Minimum
Debt Instrument
Revolving credit facility interest rate	0.875%
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Rate 1 | Maximum
Debt Instrument
Revolving credit facility interest rate	1.50%
Federal Funds Purchased | Revolving Credit Facility | Rate 2B
Debt Instrument
Revolving credit facility interest rate	0.50%
One Month LIBOR | Revolving Credit Facility | Rate 2C
Debt Instrument
Revolving credit facility interest rate	1.00%
Level 2
Debt Instrument
Estimated market value of outstanding senior notes																$ 11,100,000,000				$ 8,400,000,000