DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Derivative Activities Recorded in the Statement of Consolidated Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss), net			$ (241)	$ (66)
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Realized gain (loss), net	$ (37)	$ 13	(37)	28
Unrealized gain (loss), net	(138)	(21)	(241)	(66)
Derivative instrument losses, net	(175)	(8)	(278)	(38)
Commodity derivative instruments | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Realized gain (loss), net	(36)	31	(36)	46
Unrealized gain (loss), net	(111)	(27)	(94)	(66)
Pipeline capacity embedded derivatives | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss), net	(17)	0	(70)	0
Foreign currency derivative instruments | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Realized gain (loss), net	(1)	0	(1)	0
Unrealized gain (loss), net	1	0	(4)	0
Preferred units embedded derivative | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss), net	(11)	0	(73)	0
Treasury-lock | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Realized gain (loss), net	0	(18)	0	(18)
Unrealized gain (loss), net	$ 0	$ 6	$ 0	$ 0