DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Activities Recorded in the Statement of Consolidated Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Realized gain (loss), net	$ 25	$ (136)	$ 9
Unrealized gain (loss), net	69	(87)	(44)
Derivative instrument gains (losses), net	94	(223)	(35)
Commodity derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Realized gain (loss), net	25	(135)	27
Unrealized gain (loss), net	(20)	11	(44)
Pipeline capacity embedded derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss), net	7	(61)	8
Foreign currency derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Realized gain (loss), net	0	(1)	0
Unrealized gain (loss), net	0	(1)	1
Treasury-lock
Derivative Instruments, Gain (Loss) [Line Items]
Realized gain (loss), net	0	0	(18)
Preferred Units embedded derivative
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss), net	$ 82	$ (36)	$ (9)