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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions		6 Months Ended
	Dec. 16, 2019	Jun. 30, 2020	Dec. 31, 2019
Liabilities:
Highly liquid investments, maturity period (or less)		3 months
US Securities Litigation | Settled Litigation | NEW JERSEY
Liabilities:
Settlement, escrow fund included in restricted cash	$ 1,210	$ 1,010
Foreign currency exchange contracts | Not Designated as Hedging Instrument
Liabilities:
Derivative Liabilities		1
Recurring basis
Assets:
Cash equivalents		388	$ 2,696
Restricted cash		1,011	1
Liabilities:
Acquisition-related contingent consideration		316	316
Recurring basis | Cross-currency swaps | Net Investment Hedging | Designated as Hedging Instrument
Assets:
Derivative Assets		42	0
Liabilities:
Derivative Liabilities		0	13
Recurring basis | Foreign currency exchange contracts | Not Designated as Hedging Instrument
Assets:
Derivative Assets		1	0
Liabilities:
Derivative Liabilities		2	0
Recurring basis | Level 1
Assets:
Cash equivalents		356	2,646
Restricted cash		1,011	1
Liabilities:
Acquisition-related contingent consideration		0	0
Recurring basis | Level 1 | Cross-currency swaps | Net Investment Hedging | Designated as Hedging Instrument
Assets:
Derivative Assets		0	0
Liabilities:
Derivative Liabilities		0	0
Recurring basis | Level 1 | Foreign currency exchange contracts | Not Designated as Hedging Instrument
Assets:
Derivative Assets		0	0
Liabilities:
Derivative Liabilities		0	0
Recurring basis | Level 2
Assets:
Cash equivalents		32	50
Restricted cash		0	0
Liabilities:
Acquisition-related contingent consideration		0	0
Recurring basis | Level 2 | Cross-currency swaps | Net Investment Hedging | Designated as Hedging Instrument
Assets:
Derivative Assets		42	0
Liabilities:
Derivative Liabilities		0	13
Recurring basis | Level 2 | Foreign currency exchange contracts | Not Designated as Hedging Instrument
Assets:
Derivative Assets		1	0
Liabilities:
Derivative Liabilities		2	0
Recurring basis | Level 3
Assets:
Cash equivalents		0	0
Restricted cash		0	0
Liabilities:
Acquisition-related contingent consideration		316	316
Recurring basis | Level 3 | Cross-currency swaps | Net Investment Hedging | Designated as Hedging Instrument
Assets:
Derivative Assets		0	0
Liabilities:
Derivative Liabilities		0	0
Recurring basis | Level 3 | Foreign currency exchange contracts | Not Designated as Hedging Instrument
Assets:
Derivative Assets		0	0
Liabilities:
Derivative Liabilities		$ 0	$ 0

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