QUARTERLY FINANCIAL DATA (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 1,104	$ 975	$ 1,021	$ 864	$ 633	$ 537	$ 527	$ 479	$ 3,964	$ 2,176	$ 1,205
Income (loss) from operations	(384)	349	411	319	195	268	281	267	695	1,011	605
Income tax expense (benefit)	(124)	102	102	(33)	85	43	(7)	47	47	168	(20)
Net income (loss)	(472)	388	356	43	306	160	301	178	315	945	517
Net income attributable to non-controlling interest	15	20	7	33	(1)	3	82	15	75	99	35
Net income (loss) attributable to Diamondback Energy, Inc.	$ (487)	$ 368	$ 349	$ 10	$ 307	$ 157	$ 219	$ 163	$ 240	$ 846	$ 482
Earnings per common share
Basic (in dollars per share)	$ (3.04)	$ 2.27	$ 2.12	$ 0.06	$ 2.50	$ 1.59	$ 2.22	$ 1.65	$ 1.47	$ 8.09	$ 4.95
Diluted (in dollars per share)	$ (3.04)	$ 2.26	$ 2.11	$ 0.06	$ 2.50	$ 1.59	$ 2.22	$ 1.65	$ 1.47	$ 8.06	$ 4.94