EQUITY METHOD INTERESTS - Rollforward Activity (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Movement In Equity Method Interests [Roll Forward]
Equity method interest, beginning balance	[1]	$ 1,365
Capital contributions		2	$ 21
Equity method interest, ending balance	[1]	576
ALTM
Movement In Equity Method Interests [Roll Forward]
Equity method interest, beginning balance		1,365
Capital contributions		2
Distributions		(21)
Equity income (loss), net		21
Deconsolidation of Altus		(1,367)
Equity method interest, ending balance		0
Gulf Coast Express Pipeline LLC | ALTM
Movement In Equity Method Interests [Roll Forward]
Equity method interest, beginning balance		274
Capital contributions		0
Distributions		(5)
Equity income (loss), net		8
Deconsolidation of Altus		(277)
Equity method interest, ending balance		0
EPIC Crude Holdings, LP | ALTM
Movement In Equity Method Interests [Roll Forward]
Equity method interest, beginning balance		0
Capital contributions		2
Distributions		0
Equity income (loss), net		(2)
Deconsolidation of Altus		0
Equity method interest, ending balance		0
Permian Highway Pipeline LLC | ALTM
Movement In Equity Method Interests [Roll Forward]
Equity method interest, beginning balance		630
Capital contributions		0
Distributions		(9)
Equity income (loss), net		10
Deconsolidation of Altus		(631)
Equity method interest, ending balance		0
Breviloba, LLC | ALTM
Movement In Equity Method Interests [Roll Forward]
Equity method interest, beginning balance		461
Capital contributions		0
Distributions		(7)
Equity income (loss), net		5
Deconsolidation of Altus		(459)
Equity method interest, ending balance		$ 0

[1] The Altus VIE amounts are disclosed as of December 31, 2021. All Altus balances were deconsolidated as of February 22, 2022. Refer to Note 1—Summary of Significant Accounting Policies and Note 3—Acquisitions and Divestitures for further detail.