DEBT (Outstanding Debt) (Details) $ / shares in Units, € in Millions, $ in Millions	1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($)	Apr. 30, 2020 USD ($) Days $ / shares	Aug. 31, 2014 USD ($) Days $ / shares	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2020 EUR (€)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 USD ($)	Aug. 31, 2017	Mar. 31, 2017	May 31, 2016	Nov. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	May 31, 2013 USD ($)
Debt Instrument
Outstanding Principal  Amount										$ 11,011		$ 7,711
Unamortized Debt Discount and Debt Issuance Cost										(182)		(71)
Carrying Value										$ 10,829		$ 7,640
Description of Senior Notes
Debt financing costs paid						$ 38	$ 0
0.35% Convertible Senior Notes due June 2020
Description of Senior Notes
Aggregate principal amount																			$ 1,000
Interest rate on long-term debt											0.35%	0.35%							0.35%
Payments related to principal amount	$ 1,000
Payments related to conversion value in excess of the principal amount of senior notes	$ 245
Effective interest rate at debt origination																			3.13%
Debt discount related to convertible notes, net of tax																			$ 92
Debt discount related to convertible notes, before tax																			$ 154
Amortization of debt discount included in interest expense						1	2
0.9% Convertible Senior Notes due September 2021
Description of Senior Notes
Aggregate principal amount			$ 1,000
Interest rate on long-term debt			0.90%						0.90%	0.90%	0.90%	0.90%
Debt financing costs paid								$ 11
Convertible debt conversion price (in dollars per share) | $ / shares			$ 2,055.50
Ratio of closing share price to conversion price as a condition for conversion of the convertible notes, minimum			150.00%
Effective interest rate at debt origination			3.18%
Debt discount related to convertible notes, net of tax			$ 83
Debt discount related to convertible notes, before tax			$ 143
0.9% Convertible Senior Notes due September 2021 | Long-term Debt
Debt Instrument
Outstanding Principal  Amount												$ 1,000
Unamortized Debt Discount and Debt Issuance Cost												(39)
Carrying Value												$ 961
0.8% (€1 Billion) Senior Notes due March 2022
Description of Senior Notes
Aggregate principal amount | €									€ 1,000		€ 1,000
Interest rate on long-term debt									0.80%	0.80%	0.80%	0.80%
Effective interest rate at debt origination														0.84%
0.8% (€1 Billion) Senior Notes due March 2022 | Long-term Debt
Debt Instrument
Outstanding Principal  Amount										$ 1,173		$ 1,123
Unamortized Debt Discount and Debt Issuance Cost										(2)		(3)
Carrying Value										$ 1,171		$ 1,120
2.15% (€750 Million) Senior Notes due November 2022
Description of Senior Notes
Aggregate principal amount | €									€ 750		€ 750
Interest rate on long-term debt									2.15%	2.15%	2.15%	2.15%
Effective interest rate at debt origination																2.20%
2.15% (€750 Million) Senior Notes due November 2022 | Long-term Debt
Debt Instrument
Outstanding Principal  Amount										$ 879		$ 842
Unamortized Debt Discount and Debt Issuance Cost										(2)		(3)
Carrying Value										$ 877		$ 839
2.75% Senior Notes due March 2023
Description of Senior Notes
Interest rate on long-term debt									2.75%	2.75%	2.75%	2.75%
Effective interest rate at debt origination													2.78%
2.75% Senior Notes due March 2023 | Long-term Debt
Debt Instrument
Outstanding Principal  Amount										$ 500		$ 500
Unamortized Debt Discount and Debt Issuance Cost										(2)		(2)
Carrying Value										$ 498		$ 498
2.375% (€1 Billion) Senior Notes due September 2024
Description of Senior Notes
Aggregate principal amount | €									€ 1,000		€ 1,000
Interest rate on long-term debt									2.375%	2.375%	2.375%	2.375%
Effective interest rate at debt origination																		2.48%
2.375% (€1 Billion) Senior Notes due September 2024 | Long-term Debt
Debt Instrument
Outstanding Principal  Amount										$ 1,173		$ 1,123
Unamortized Debt Discount and Debt Issuance Cost										(7)		(9)
Carrying Value										$ 1,166		$ 1,114
3.65% Senior Notes due March 2025
Description of Senior Notes
Interest rate on long-term debt									3.65%	3.65%	3.65%	3.65%
Effective interest rate at debt origination																	3.68%
3.65% Senior Notes due March 2025 | Long-term Debt
Debt Instrument
Outstanding Principal  Amount										$ 500		$ 500
Unamortized Debt Discount and Debt Issuance Cost										(2)		(2)
Carrying Value										$ 498		$ 498
4.1% Senior Notes due April 2025
Debt Instrument
Outstanding Principal  Amount		$ 1,000
Description of Senior Notes
Interest rate on long-term debt		4.10%							4.10%	4.10%
Effective interest rate at debt origination		4.10%
4.1% Senior Notes due April 2025 | Long-term Debt
Debt Instrument
Outstanding Principal  Amount										$ 1,000
Unamortized Debt Discount and Debt Issuance Cost										(5)
Carrying Value										$ 995
0.75% Convertible Senior Notes due May 2025
Description of Senior Notes
Aggregate principal amount		$ 863
Interest rate on long-term debt		0.75%							0.75%	0.75%
Debt financing costs paid						19
Convertible debt conversion price (in dollars per share) | $ / shares		$ 1,886.44
Ratio of closing share price to conversion price as a condition for conversion of the convertible notes, minimum		130.00%
Effective interest rate at debt origination		4.10%
Debt discount related to convertible notes, net of tax		$ 100
Debt discount related to convertible notes, before tax		130
0.75% Convertible Senior Notes due May 2025 | Long-term Debt
Debt Instrument
Outstanding Principal  Amount										$ 863
Unamortized Debt Discount and Debt Issuance Cost										(133)
Carrying Value										$ 730
3.6% Senior Notes due June 2026
Description of Senior Notes
Interest rate on long-term debt									3.60%	3.60%	3.60%	3.60%
Effective interest rate at debt origination															3.62%
3.6% Senior Notes due June 2026 | Long-term Debt
Debt Instrument
Outstanding Principal  Amount										$ 1,000		$ 1,000
Unamortized Debt Discount and Debt Issuance Cost										(5)		(5)
Carrying Value										$ 995		$ 995
1.8% (€1 Billion) Senior Notes due March 2027
Description of Senior Notes
Aggregate principal amount | €									€ 1,000		€ 1,000
Interest rate on long-term debt									1.80%	1.80%	1.80%	1.80%
Effective interest rate at debt origination																	1.80%
1.8% (€1 Billion) Senior Notes due March 2027 | Long-term Debt
Debt Instrument
Outstanding Principal  Amount										$ 1,173		$ 1,123
Unamortized Debt Discount and Debt Issuance Cost										(4)		(5)
Carrying Value										$ 1,169		$ 1,118
4.5% Senior Notes due April 2027
Debt Instrument
Outstanding Principal  Amount		$ 750
Description of Senior Notes
Interest rate on long-term debt		4.50%							4.50%	4.50%
Effective interest rate at debt origination		4.54%
4.5% Senior Notes due April 2027 | Long-term Debt
Debt Instrument
Outstanding Principal  Amount										$ 750
Unamortized Debt Discount and Debt Issuance Cost										(6)
Carrying Value										$ 744
3.55% Senior Notes due March 2028
Description of Senior Notes
Interest rate on long-term debt									3.55%	3.55%	3.55%	3.55%
Effective interest rate at debt origination													3.56%
3.55% Senior Notes due March 2028 | Long-term Debt
Debt Instrument
Outstanding Principal  Amount										$ 500		$ 500
Unamortized Debt Discount and Debt Issuance Cost										(3)		(3)
Carrying Value										$ 497		497
4.625% Senior Notes due April 2030
Debt Instrument
Outstanding Principal  Amount		$ 1,500
Description of Senior Notes
Interest rate on long-term debt		4.625%							4.625%	4.625%
Effective interest rate at debt origination		4.65%
4.625% Senior Notes due April 2030 | Long-term Debt
Debt Instrument
Outstanding Principal  Amount										$ 1,500
Unamortized Debt Discount and Debt Issuance Cost										(11)
Carrying Value										1,489
Convertible Debt
Description of Senior Notes
Interest expense related to debt				$ 17	$ 16	53	47
Amortization of debt discount included in interest expense				12	12	39	36
Coupon Interest expense				$ 4	$ 3	$ 11	$ 9
Debt, weighted average interest rate				3.90%	3.20%	3.50%	3.20%
Other Long-term Debt
Debt Instrument
Carrying Value										10,100		6,700
Description of Senior Notes
Interest expense related to debt				$ 79	$ 42	$ 193	$ 125
Coupon Interest expense				$ 77	$ 40	187	$ 120
Minimum | 0.9% Convertible Senior Notes due September 2021
Description of Senior Notes
Minimum and Maximum consecutive days the closing sales price of common stock must exceed a specified percentage of conversion price to trigger conversion feature of note (in days) | Days			20
Additional payment to debt holder, settled In shares, aggregate value			$ 0
Minimum | 0.75% Convertible Senior Notes due May 2025
Description of Senior Notes
Minimum and Maximum consecutive days the closing sales price of common stock must exceed a specified percentage of conversion price to trigger conversion feature of note (in days) | Days		20
Additional payment to debt holder, settled In shares, aggregate value		$ 0
Maximum | 0.9% Convertible Senior Notes due September 2021
Description of Senior Notes
Minimum and Maximum consecutive days the closing sales price of common stock must exceed a specified percentage of conversion price to trigger conversion feature of note (in days) | Days			30
Additional payment to debt holder, settled In shares, aggregate value			$ 375
Maximum | 0.75% Convertible Senior Notes due May 2025
Description of Senior Notes
Minimum and Maximum consecutive days the closing sales price of common stock must exceed a specified percentage of conversion price to trigger conversion feature of note (in days) | Days		30
Additional payment to debt holder, settled In shares, aggregate value		$ 235
Level 2
Description of Senior Notes
Estimated market value of outstanding debt										13,300		9,800
Designated as Hedging Instrument | Minimum | Euro-Denominated Debt
Description of Senior Notes
Notional amount of nonderivative instruments						1,800
Designated as Hedging Instrument | Maximum | Euro-Denominated Debt
Description of Senior Notes
Notional amount of nonderivative instruments						$ 3,200
Short-term Debt | 0.35% Convertible Senior Notes due June 2020
Debt Instrument
Outstanding Principal  Amount												1,000
Unamortized Debt Discount and Debt Issuance Cost												(12)
Carrying Value												$ 988
Short-term Debt | 0.9% Convertible Senior Notes due September 2021
Debt Instrument
Outstanding Principal  Amount										1,000
Unamortized Debt Discount and Debt Issuance Cost										(21)
Carrying Value										$ 979