EQUITY METHOD INTERESTS - Summary of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity method interests	$ 1,365	$ 1,555
Shin Oak Pipeline (Breviloba, LLC)
Schedule of Equity Method Investments [Line Items]
Equity method interests		480
ALTM
Schedule of Equity Method Investments [Line Items]
Equity method interests	$ 1,365	1,555	$ 1,258
ALTM | Gulf Coast Express Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Interest	16.00%
Equity method interests	$ 274	284	291
ALTM | EPIC Crude Holdings, LP
Schedule of Equity Method Investments [Line Items]
Interest	15.00%
Equity method interests	$ 0	176	163
ALTM | Permian Highway Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Interest	26.70%
Equity method interests	$ 630	615	311
ALTM | Shin Oak Pipeline (Breviloba, LLC)
Schedule of Equity Method Investments [Line Items]
Interest	33.00%
Equity method interests	$ 461	$ 480	$ 493