REPORT OF BUSINESS SEGMENTS - Summary of Business Segments (Details) - USD ($)	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
Segment Reporting Information [Line Items]
Revenues	$ 1,104,000,000	$ 975,000,000	$ 1,021,000,000	$ 864,000,000	$ 633,000,000	$ 537,000,000	$ 527,000,000	$ 479,000,000	$ 3,964,000,000	$ 2,176,000,000	$ 1,205,000,000
Depreciation, depletion and amortization									1,447,000,000	623,000,000	327,000,000
Impairment of oil and natural gas properties									790,000,000	0	0
Income from operations	(384,000,000)	349,000,000	411,000,000	319,000,000	195,000,000	268,000,000	281,000,000	267,000,000	695,000,000	1,011,000,000	605,000,000
Interest expense, net									(172,000,000)	(87,000,000)	(41,000,000)
Total other income (expense), net									(333,000,000)	102,000,000	(108,000,000)
Provision for income taxes	(124,000,000)	102,000,000	102,000,000	(33,000,000)	85,000,000	43,000,000	(7,000,000)	47,000,000	47,000,000	168,000,000	(20,000,000)
Net income attributable to non-controlling interest	15,000,000	20,000,000	7,000,000	33,000,000	(1,000,000)	3,000,000	82,000,000	15,000,000	75,000,000	99,000,000	35,000,000
Net income attributable to Diamondback Energy	(487,000,000)	$ 368,000,000	$ 349,000,000	$ 10,000,000	307,000,000	$ 157,000,000	$ 219,000,000	$ 163,000,000	240,000,000	846,000,000	482,000,000
Total assets	23,531,000,000				21,596,000,000				23,531,000,000	21,596,000,000	7,771,000,000
Upstream
Segment Reporting Information [Line Items]
Revenues									3,891,000,000	2,132,000,000	1,198,000,000
Midstream Services
Segment Reporting Information [Line Items]
Revenues									448,000,000	184,000,000	39,000,000
Impairment of oil and natural gas properties									2,000,000
Operating Segments | Upstream
Segment Reporting Information [Line Items]
Revenues									3,891,000,000	2,132,000,000	1,198,000,000
Depreciation, depletion and amortization									1,405,000,000	598,000,000	324,000,000
Impairment of oil and natural gas properties									790,000,000
Income from operations									790,000,000	1,071,000,000	613,000,000
Interest expense, net									(171,000,000)	(87,000,000)	(41,000,000)
Total other income (expense), net									(320,000,000)	102,000,000	(109,000,000)
Provision for income taxes									21,000,000	151,000,000	(24,000,000)
Net income attributable to non-controlling interest									75,000,000	99,000,000	35,000,000
Net income attributable to Diamondback Energy									374,000,000	923,000,000	493,000,000
Total assets	22,125,000,000				21,096,000,000				22,125,000,000	21,096,000,000	7,475,000,000
Operating Segments | Midstream Services
Segment Reporting Information [Line Items]
Revenues									73,000,000	44,000,000	7,000,000
Depreciation, depletion and amortization									42,000,000	25,000,000	3,000,000
Impairment of oil and natural gas properties									0
Income from operations									219,000,000	80,000,000	24,000,000
Interest expense, net									(1,000,000)	0	0
Total other income (expense), net									(7,000,000)	0	1,000,000
Provision for income taxes									26,000,000	17,000,000	4,000,000
Net income attributable to non-controlling interest									91,000,000	0	0
Net income attributable to Diamondback Energy									95,000,000	63,000,000	21,000,000
Total assets	1,636,000,000				604,000,000				1,636,000,000	604,000,000	300,000,000
Eliminations
Segment Reporting Information [Line Items]
Revenues									(375,000,000)	(140,000,000)	(32,000,000)
Depreciation, depletion and amortization									0	0	0
Impairment of oil and natural gas properties									0
Income from operations									(314,000,000)	(140,000,000)	(32,000,000)
Interest expense, net									0	0	0
Total other income (expense), net									(6,000,000)	0	0
Provision for income taxes									0	0	0
Net income attributable to non-controlling interest									(91,000,000)	0	0
Net income attributable to Diamondback Energy									(229,000,000)	(140,000,000)	(32,000,000)
Total assets	$ (230,000,000)				$ (104,000,000)				$ (230,000,000)	$ (104,000,000)	$ (4,000,000)