EQUITY METHOD INTERESTS - Rollforward Activity (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Movement In Equity Method Interests [Roll Forward]
Equity method interest, beginning balance		$ 1,555	$ 1,258
Capital contributions		28	327	$ 501
Distributions		(173)	(97)
Capitalized interest			8
Equity income (loss), net		114	59
Accumulated other comprehensive loss		1
Impairment	$ (160)	(160)	0	0
Equity method interest, ending balance	1,365	1,365	1,555	1,258
ALTM
Movement In Equity Method Interests [Roll Forward]
Capitalized interest			8
Gulf Coast Express Pipeline LLC
Movement In Equity Method Interests [Roll Forward]
Equity method interest, beginning balance		284	291
Capital contributions		0	2
Distributions		(50)	(51)
Capitalized interest			0
Equity income (loss), net		40	42
Accumulated other comprehensive loss		0
Impairment		0
Equity method interest, ending balance	274	274	284	291
EPIC Crude Holdings, LP
Movement In Equity Method Interests [Roll Forward]
Equity method interest, beginning balance		176	163
Capital contributions		2	29
Distributions		0	0
Capitalized interest			0
Equity income (loss), net		(19)	(16)
Accumulated other comprehensive loss		1
Impairment		(160)
Equity method interest, ending balance	0	0	176	163
Permian Highway Pipeline LLC
Movement In Equity Method Interests [Roll Forward]
Equity method interest, beginning balance		615	311
Capital contributions		26	296
Distributions		(74)	0
Capitalized interest			8
Equity income (loss), net		63	0
Accumulated other comprehensive loss		0
Impairment		0
Equity method interest, ending balance	630	630	615	311
Shin Oak Pipeline (Breviloba, LLC)
Movement In Equity Method Interests [Roll Forward]
Equity method interest, beginning balance		480	493
Capital contributions		0	0
Distributions		(49)	(46)
Capitalized interest			0
Equity income (loss), net		30	33
Accumulated other comprehensive loss		0
Impairment		0
Equity method interest, ending balance	$ 461	$ 461	$ 480	$ 493