DEBT - Narrative (Details) $ / shares in Units, € in Millions	1 Months Ended				3 Months Ended			12 Months Ended
	Apr. 30, 2021 USD ($)	Apr. 30, 2020 USD ($) day $ / shares	Aug. 31, 2019 USD ($)	Aug. 31, 2014 USD ($) day $ / shares	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2021 EUR (€)
Level 2
Debt Instrument
Estimated market value of outstanding debt						$ 15,500,000,000		$ 14,000,000,000.0
Convertible Debt | 0.75% Convertible Senior Notes due May 2025
Debt Instrument
Aggregate principal amount		$ 863,000,000
Stated interest rate		0.75%				0.75%		0.75%		0.75%
Payments of debt issuance costs								$ 19,000,000
Conversion price | $ / shares		$ 1,886.44
Ratio of closing share price to conversion price as a condition for conversion of the convertible notes, minimum		130.00%
If-converted value in excess of principal						$ 201,000,000
Effective interest rate at debt origination		4.10%
Debt discount related to convertible notes, net of tax		$ 100,000,000
Debt discount related to convertible notes, before tax		$ 130,000,000
Aggregate principal amount						863,000,000		863,000,000
Convertible Debt | 0.9% Convertible Senior Notes due September 2021
Debt Instrument
Aggregate principal amount				$ 1,000,000,000.0
Stated interest rate				0.90%
Payments of debt issuance costs									$ 11,000,000
Conversion price | $ / shares				$ 2,055.50
Ratio of closing share price to conversion price as a condition for conversion of the convertible notes, minimum				150.00%
If-converted value in excess of principal						131,000,000
Effective interest rate at debt origination				3.18%
Debt discount related to convertible notes, net of tax				$ 83,000,000
Debt discount related to convertible notes, before tax				$ 143,000,000
Senior Notes
Debt Instrument
Carrying value of long-term debt						$ 12,100,000,000		$ 10,300,000,000
Senior Notes | Subsequent Event
Debt Instrument
Payments to redeem debt	$ 2,000,000,000.0
Senior Notes | 0.1% (€950 million) Senior Notes due March 2025
Debt Instrument
Aggregate principal amount | €										€ 950
Stated interest rate						0.10%				0.10%
Effective interest rate at debt origination						0.30%				0.30%
Aggregate principal amount						$ 1,118,000,000				€ 950
Senior Notes | 0.5% (€750 million) Senior Notes due March 2028
Debt Instrument
Aggregate principal amount | €										€ 750
Stated interest rate						0.50%				0.50%
Effective interest rate at debt origination						0.63%				0.63%
Aggregate principal amount						$ 881,000,000				€ 750
Senior Notes | 4.1% Senior Notes due April 2025 and 4.1% Senior Notes due April 2027 | Subsequent Event
Debt Instrument
Loss on extinguishment of debt					$ 242,000,000
Senior Notes | 4.1% Senior Notes due April 2025
Debt Instrument
Stated interest rate		4.10%						4.10%
Effective interest rate at debt origination		4.22%
Aggregate principal amount								$ 1,000,000,000
Senior Notes | 4.1% Senior Notes due April 2025 | Subsequent Event
Debt Instrument
Payments to redeem debt	1,100,000,000
Senior Notes | 4.5% Senior Notes due April 2027
Debt Instrument
Stated interest rate		4.50%						4.50%
Effective interest rate at debt origination		4.63%
Aggregate principal amount								$ 750,000,000
Senior Notes | 4.5% Senior Notes due April 2027 | Subsequent Event
Debt Instrument
Payments to redeem debt	$ 868,000,000
Minimum | Euro-Denominated Debt | Designated as Hedging Instrument
Debt Instrument
Carrying value of the portions of euro-denominated debt designated as a net investment hedge						2,700,000,000	$ 2,100,000,000
Minimum | Convertible Debt | 0.75% Convertible Senior Notes due May 2025
Debt Instrument
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) | day		20
Additional payment to debt holder, settled In shares, aggregate value		$ 0
Minimum | Convertible Debt | 0.9% Convertible Senior Notes due September 2021
Debt Instrument
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) | day				20
Additional payment to debt holder, settled In shares, aggregate value				$ 0
Maximum | Euro-Denominated Debt | Designated as Hedging Instrument
Debt Instrument
Carrying value of the portions of euro-denominated debt designated as a net investment hedge						2,800,000,000	$ 3,200,000,000
Maximum | Convertible Debt | 0.75% Convertible Senior Notes due May 2025
Debt Instrument
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) | day		30
Additional payment to debt holder, settled In shares, aggregate value		$ 235,000,000
Maximum | Convertible Debt | 0.9% Convertible Senior Notes due September 2021
Debt Instrument
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) | day				30
Additional payment to debt holder, settled In shares, aggregate value				$ 375,000,000
Revolving Credit Facility
Debt Instrument
Revolving credit facility, maximum borrowing capacity			$ 2,000,000,000.0
Revolving credit facility, term			5 years
Line of credit, current						0		0
Debt instrument, covenant, minimum liquidity amount								4,500,000,000
Debt instrument, covenant, pro forma liquidity required for distribution and share repurchases								6,000,000,000.0
Revolving Credit Facility | Minimum
Debt Instrument
Commitment fee rate			0.07%
Revolving Credit Facility | Maximum
Debt Instrument
Commitment fee rate			0.20%
Revolving Credit Facility | Rate 1 | Minimum | London Interbank Offered Rate (LIBOR)
Debt Instrument
Reference rate			0.00%
Basis spread on variable rate			0.875%
Revolving Credit Facility | Rate 1 | Maximum | London Interbank Offered Rate (LIBOR)
Debt Instrument
Basis spread on variable rate			1.50%
Revolving Credit Facility | Rate 2B | Federal Funds Purchased
Debt Instrument
Basis spread on variable rate			0.50%
Revolving Credit Facility | Rate 2C | One Month LIBOR
Debt Instrument
Basis spread on variable rate			1.00%
Revolving Credit Facility | Rate 2C | Minimum
Debt Instrument
Basis spread on variable rate			0.00%
Revolving Credit Facility | Rate 2C | Minimum | One Month LIBOR
Debt Instrument
Reference rate			0.00%
Revolving Credit Facility | Rate 2C | Maximum
Debt Instrument
Basis spread on variable rate			0.50%
Letter of Credit
Debt Instrument
Revolving credit facility, maximum borrowing capacity			$ 80,000,000
Letters of credit issued						$ 4,000,000		$ 4,000,000
Swingline Loans
Debt Instrument
Revolving credit facility, maximum borrowing capacity			$ 100,000,000