DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Derivative Assets and Liabilities and Locations on Consolidated Balance Sheet (Details) - Recurring - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative asset	$ 2	$ 55
Derivative liability	105	11
Current Assets: Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset	2	55
Current Liabilities: Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	7	11
Deferred Credits and Other Noncurrent Liabilities: Other
Derivatives, Fair Value [Line Items]
Derivative liability	$ 98	$ 0