FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Fair Value Measurement) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) yr percentage	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	$ 2,236		$ 1,718
Equity Securities, FV-NI	3,256		3,452
Contingent consideration fair value adjustments	(510)	$ 556
Debt Securities, Available-for-sale, Amortized Cost	2,225		1,704
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	11		14
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0		0
Equity Securities without Readily Determinable Fair Value, Amount	616		694
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount	31	75
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount	(1)	(188)
Equity Securities, FV-NI, Realized Gain (Loss)	(3)	0
Equity Securities, FV-NI, Unrealized Gain (Loss)	437	(228)
Equity Securities, FV-NI, Equity Securities Without Readily Determinable Fair Value, and Equity Method Investments	4,555		4,695
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount	218
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount	(167)
Unrealized Gain (Loss) on Investments	381	(228)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0		0
Derivative asset	0		0
Derivative Liability	0		0
Contingent consideration fair value	0		0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	8,381		12,361
Derivative asset	165		42
Derivative Liability	(72)		(270)
Contingent consideration fair value	0		0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0		0
Derivative asset	27		27
Derivative Liability	0		0
Contingent consideration fair value	79	69	78	$ 106
Contingent consideration fair value adjustments	3	(36)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Due to Foreign Exchange, Liability	(2)	$ (1)
Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,633		1,020
Debt Securities, Available-for-sale, Amortized Cost	1,633		1,020
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0		0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0		0
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,633		1,020
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	603		698
Debt Securities, Available-for-sale, Amortized Cost	592		684
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	11		14
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0		0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	603		698
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Other Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	3,094		3,314
Other Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	162		138
Other Assets [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	0		0
Portion at Other than Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments	683		549
Contingent Value Rights [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration fair value	9		530
Contingent Value Rights [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration fair value	0		0
Contingent Value Rights [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration fair value	$ 0		$ 0
Probability of payment [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Measurement Input | percentage	1
Probability of payment [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Measurement Input | percentage	0.028
Probability of payment [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Measurement Input | percentage	0
Measurement Input, Discount Rate [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Measurement Input | percentage	0.008
Measurement Input, Discount Rate [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Measurement Input | percentage	0.004
Measurement Input, Discount Rate [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Measurement Input | percentage	0.002
Projected Year of Payments | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input [Extensible List] | yr	2,025
Projected Year of Payments | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input [Extensible List] | yr	2,021