EQUITY METHOD INVESTMENTS - Investments (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 20, 2019	Oct. 01, 2019	Jul. 30, 2019	Feb. 15, 2019	Feb. 01, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 479						$ 1
Rattler LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments	479						1
Rattler LLC | Epic Pipeline
Schedule of Equity Method Investments [Line Items]
Ownership interest						10.00%
Equity method investments	110						0
Rattler LLC | Gray Oak Pipeline
Schedule of Equity Method Investments [Line Items]
Ownership interest					10.00%
Equity method investments	115						1
Rattler LLC | Wink To Webster Pipeline
Schedule of Equity Method Investments [Line Items]
Ownership interest				4.00%
Equity method investments	34						0
Rattler LLC | OMOG JV LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest			60.00%
Equity method investments	219						0
Rattler LLC | Amarillo Rattler, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest		50.00%
Equity method investments	$ 1						$ 0