FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Assets and Liabilities Measured on a Non-Recurring Basis (Details) - Fair Value, Nonrecurring - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Other non-current assets:
Non-current assets held for sale	$ 39	$ 0
Quoted Prices in Active Markets for Identical Assets (Level 1)
Other non-current assets:
Non-current assets held for sale	0	0
Significant Other Observable Inputs (Level 2)
Other non-current assets:
Non-current assets held for sale	0	0
Significant Unobservable Inputs (Level 3)
Other non-current assets:
Non-current assets held for sale	$ 39	$ 0