DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Derivative Assets and Liabilities and Locations on Consolidated Balance Sheet (Details) - Recurring - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative asset	$ 24	$ 9
Derivative liability	221	103
Current Assets: Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset	24	2
Other Assets: Deferred charges and other
Derivatives, Fair Value [Line Items]
Derivative asset	0	7
Current Liabilities: Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	54	0
Deferred Credits and Other Noncurrent Liabilities: Other
Derivatives, Fair Value [Line Items]
Derivative liability	$ 167	$ 103