DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets:
Derivative asset	$ 0	$ 11
Liabilities:
Derivative liability	113	192
Commodity Derivative Instruments
Assets:
Derivative asset, fair value		11
Derivative asset, netting		0
Derivative asset		11
Liabilities:
Derivative liability, fair value, gross liability	10
Derivative liability, netting	0
Derivative liability	10
Commodity Derivative Instruments | Quoted Price in Active Markets (Level 1)
Assets:
Derivative asset, fair value		0
Liabilities:
Derivative liability, fair value, gross liability	0
Commodity Derivative Instruments | Significant Other Inputs (Level 2)
Assets:
Derivative asset, fair value		11
Liabilities:
Derivative liability, fair value, gross liability	10
Commodity Derivative Instruments | Significant Unobservable Inputs (Level 3)
Assets:
Derivative asset, fair value		0
Liabilities:
Derivative liability, fair value, gross liability	0
Pipeline capacity embedded derivatives
Liabilities:
Derivative liability, fair value, gross liability	46	53
Derivative liability, netting	0	0
Derivative liability	46	53
Pipeline capacity embedded derivatives | Quoted Price in Active Markets (Level 1)
Liabilities:
Derivative liability, fair value, gross liability	0	0
Pipeline capacity embedded derivatives | Significant Other Inputs (Level 2)
Liabilities:
Derivative liability, fair value, gross liability	46	53
Pipeline capacity embedded derivatives | Significant Unobservable Inputs (Level 3)
Liabilities:
Derivative liability, fair value, gross liability	0	0
Preferred Units embedded derivative
Liabilities:
Derivative liability, fair value, gross liability	57	139
Derivative liability, netting	0	0
Derivative liability	57	139
Preferred Units embedded derivative | Quoted Price in Active Markets (Level 1)
Liabilities:
Derivative liability, fair value, gross liability	0	0
Preferred Units embedded derivative | Significant Other Inputs (Level 2)
Liabilities:
Derivative liability, fair value, gross liability	0	0
Preferred Units embedded derivative | Significant Unobservable Inputs (Level 3)
Liabilities:
Derivative liability, fair value, gross liability	$ 57	$ 139