DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Derivative Assets and Liabilities and Locations on Consolidated Balance Sheet (Details) - Recurring - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative asset	$ 38	$ 11
Derivative liability	209	192
Current Assets: Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset	34	6
Other Assets: Deferred charges and other
Derivatives, Fair Value [Line Items]
Derivative asset	4	5
Current Liabilities: Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	1	0
Deferred Credits and Other Noncurrent Liabilities: Other
Derivatives, Fair Value [Line Items]
Derivative liability	$ 208	$ 192