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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Assets and Liabilities Measured on a Non-Recurring Basis, Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Assets Measured at Fair Value on a Recurring Basis
Asset impairments	$ 33	$ 89	$ 49	$ 434
Disposal Group, Held-for-sale, Not Discontinued Operations
Assets Measured at Fair Value on a Recurring Basis
Impairment of long-lived assets classified as held for sale			8	$ 5
Certain Products For Disposal, September 2019 \| Disposal Group, Held-for-sale, Not Discontinued Operations
Assets Measured at Fair Value on a Recurring Basis
Impairment of long-lived assets classified as held for sale	8		8
Nonrecurring adjustment
Assets Measured at Fair Value on a Recurring Basis
Non-current assets held for sale	39		39		$ 0
Nonrecurring adjustment \| Significant Other Observable Inputs (Level 2)
Assets Measured at Fair Value on a Recurring Basis
Non-current assets held for sale	0		0		0
Fair value of long-term debt	$ 25,005		$ 25,005		$ 23,357