GUARANTOR FINANCIAL STATEMENTS - Income Statement (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
Revenues:
Lease bonus									$ 4,000,000	$ 3,000,000	$ 12,000,000
Other operating income									9,000,000	9,000,000	0
Total 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
Costs and expenses:
Lease operating expenses									490,000,000	205,000,000	127,000,000
Production and ad valorem taxes									248,000,000	133,000,000	74,000,000
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
General and administrative expenses									104,000,000	65,000,000	48,000,000
Merger and integration expense									0	36,000,000	0
Asset retirement obligation accretion									7,000,000	2,000,000	1,000,000
Other operating expense									4,000,000	3,000,000	0
Total costs and expenses									3,269,000,000	1,165,000,000	600,000,000
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
Other income (expense):
Interest expense, net									(172,000,000)	(87,000,000)	(41,000,000)
Other (expense) income, net									(2,000,000)	89,000,000	11,000,000
Gain on derivative instruments, net									(108,000,000)	101,000,000	(78,000,000)
Gain (loss) on revaluation of investment									5,000,000	(1,000,000)	0
Loss on extinguishment of debt									(56,000,000)	0	0
Income from subsidiaries									0	0	0
Total other income (expense), net									(333,000,000)	102,000,000	(108,000,000)
Income (loss) before income taxes									362,000,000	1,113,000,000	497,000,000
Provision for (benefit from) 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 (loss)	(472,000,000)	388,000,000	356,000,000	43,000,000	306,000,000	160,000,000	301,000,000	178,000,000	315,000,000	945,000,000	517,000,000
Net income (loss) 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 (loss) attributable to Diamondback Energy, Inc.	$ (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
Oil sales
Revenues:
Revenues									3,554,000,000	1,879,000,000	1,044,000,000
Natural gas sales
Revenues:
Revenues									66,000,000	61,000,000	52,000,000
Natural gas liquid sales
Revenues:
Revenues									267,000,000	190,000,000	90,000,000
Royalty income
Revenues:
Revenues									0	0	0
Midstream services
Revenues:
Revenues									64,000,000	34,000,000	7,000,000
Costs and expenses:
Cost of goods and services sold									91,000,000	72,000,000	10,000,000
Gathering and transportation
Costs and expenses:
Cost of goods and services sold									88,000,000	26,000,000	13,000,000
Eliminations
Revenues:
Lease bonus									0	(3,000,000)	0
Other operating income									(5,000,000)	0
Total revenues									(375,000,000)	(141,000,000)	(32,000,000)
Costs and expenses:
Lease operating expenses									(143,000,000)	(42,000,000)	(16,000,000)
Production and ad valorem taxes									0	0	0
Depreciation, depletion and amortization									(8,000,000)	17,000,000	4,000,000
Impairment of oil and natural gas properties									0
General and administrative expenses									(12,000,000)	(2,000,000)	(2,000,000)
Merger and integration expense										0
Asset retirement obligation accretion									0	0	0
Other operating expense									0	0
Total costs and expenses									(263,000,000)	(43,000,000)	(23,000,000)
Income from operations									(112,000,000)	(98,000,000)	(9,000,000)
Other income (expense):
Interest expense, net									0	0	0
Other (expense) income, net									(7,000,000)	(2,000,000)	(2,000,000)
Gain on derivative instruments, net									0	0	0
Gain (loss) on revaluation of investment									0	0
Loss on extinguishment of debt									0
Income from subsidiaries									(764,000,000)	(1,113,000,000)	(446,000,000)
Total other income (expense), net									(771,000,000)	(1,115,000,000)	(448,000,000)
Income (loss) before income taxes									(883,000,000)	(1,213,000,000)	(457,000,000)
Provision for (benefit from) income taxes									(1,000,000)	0	0
Net income (loss)									(882,000,000)	(1,213,000,000)	(457,000,000)
Net income (loss) attributable to non-controlling interest									(191,000,000)	(20,000,000)	35,000,000
Net income (loss) attributable to Diamondback Energy, Inc.									(691,000,000)	(1,193,000,000)	(492,000,000)
Eliminations | Oil sales
Revenues:
Revenues									264,000,000	247,000,000	140,000,000
Eliminations | Natural gas sales
Revenues:
Revenues									8,000,000	13,000,000	9,000,000
Eliminations | Natural gas liquid sales
Revenues:
Revenues									21,000,000	23,000,000	11,000,000
Eliminations | Royalty income
Revenues:
Revenues									(293,000,000)	(283,000,000)	(160,000,000)
Eliminations | Midstream services
Revenues:
Revenues									(370,000,000)	(138,000,000)	(32,000,000)
Costs and expenses:
Cost of goods and services sold									(79,000,000)	0	(1,000,000)
Eliminations | Gathering and transportation
Costs and expenses:
Cost of goods and services sold									(21,000,000)	(16,000,000)	(8,000,000)
Parent | Reportable Legal Entities
Revenues:
Lease bonus									0	0	0
Other operating income									0	0
Total revenues									0	0	0
Costs and expenses:
Lease operating expenses									0	0	0
Production and ad valorem taxes									0	0	0
Depreciation, depletion and amortization									0	0	0
Impairment of oil and natural gas properties									0
General and administrative expenses									48,000,000	28,000,000	27,000,000
Merger and integration expense										18,000,000
Asset retirement obligation accretion									0	0	0
Other operating expense									0	0
Total costs and expenses									48,000,000	46,000,000	27,000,000
Income from operations									(48,000,000)	(46,000,000)	(27,000,000)
Other income (expense):
Interest expense, net									(47,000,000)	(43,000,000)	(30,000,000)
Other (expense) income, net									3,000,000	1,000,000	1,000,000
Gain on derivative instruments, net									0	0	0
Gain (loss) on revaluation of investment									0	0
Loss on extinguishment of debt									(56,000,000)
Income from subsidiaries									764,000,000	1,113,000,000	446,000,000
Total other income (expense), net									664,000,000	1,071,000,000	417,000,000
Income (loss) before income taxes									616,000,000	1,025,000,000	390,000,000
Provision for (benefit from) income taxes									81,000,000	241,000,000	(20,000,000)
Net income (loss)									535,000,000	784,000,000	410,000,000
Net income (loss) attributable to non-controlling interest									0	0	0
Net income (loss) attributable to Diamondback Energy, Inc.									535,000,000	784,000,000	410,000,000
Parent | Reportable Legal Entities | Oil sales
Revenues:
Revenues									0	0	0
Parent | Reportable Legal Entities | Natural gas sales
Revenues:
Revenues									0	0	0
Parent | Reportable Legal Entities | Natural gas liquid sales
Revenues:
Revenues									0	0	0
Parent | Reportable Legal Entities | Royalty income
Revenues:
Revenues									0	0	0
Parent | Reportable Legal Entities | Midstream services
Revenues:
Revenues									0	0	0
Costs and expenses:
Cost of goods and services sold									0	0	0
Parent | Reportable Legal Entities | Gathering and transportation
Costs and expenses:
Cost of goods and services sold									0	0	0
Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Lease bonus									0	0	0
Other operating income									0	0
Total revenues									2,131,000,000	1,746,000,000	1,026,000,000
Costs and expenses:
Lease operating expenses									390,000,000	230,000,000	143,000,000
Production and ad valorem taxes									130,000,000	106,000,000	63,000,000
Depreciation, depletion and amortization									735,000,000	472,000,000	277,000,000
Impairment of oil and natural gas properties									0
General and administrative expenses									1,000,000	1,000,000	0
Merger and integration expense										0
Asset retirement obligation accretion									2,000,000	1,000,000	1,000,000
Other operating expense									0	0
Total costs and expenses									1,333,000,000	851,000,000	505,000,000
Income from operations									798,000,000	895,000,000	521,000,000
Other income (expense):
Interest expense, net									(74,000,000)	(20,000,000)	(6,000,000)
Other (expense) income, net									0	0	0
Gain on derivative instruments, net									(56,000,000)	169,000,000	(77,000,000)
Gain (loss) on revaluation of investment									0	0
Loss on extinguishment of debt									0
Income from subsidiaries									0	0	0
Total other income (expense), net									(130,000,000)	149,000,000	(83,000,000)
Income (loss) before income taxes									668,000,000	1,044,000,000	438,000,000
Provision for (benefit from) income taxes									0	0	0
Net income (loss)									668,000,000	1,044,000,000	438,000,000
Net income (loss) attributable to non-controlling interest									0	0	0
Net income (loss) attributable to Diamondback Energy, Inc.									668,000,000	1,044,000,000	438,000,000
Guarantor Subsidiaries | Reportable Legal Entities | Oil sales
Revenues:
Revenues									1,972,000,000	1,545,000,000	904,000,000
Guarantor Subsidiaries | Reportable Legal Entities | Natural gas sales
Revenues:
Revenues									27,000,000	43,000,000	43,000,000
Guarantor Subsidiaries | Reportable Legal Entities | Natural gas liquid sales
Revenues:
Revenues									132,000,000	158,000,000	79,000,000
Guarantor Subsidiaries | Reportable Legal Entities | Royalty income
Revenues:
Revenues									0	0	0
Guarantor Subsidiaries | Reportable Legal Entities | Midstream services
Revenues:
Revenues									0	0	0
Costs and expenses:
Cost of goods and services sold									0	0	0
Guarantor Subsidiaries | Reportable Legal Entities | Gathering and transportation
Costs and expenses:
Cost of goods and services sold									75,000,000	41,000,000	21,000,000
Non-Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Lease bonus									4,000,000	6,000,000	12,000,000
Other operating income									14,000,000	9,000,000
Total revenues									2,208,000,000	571,000,000	211,000,000
Costs and expenses:
Lease operating expenses									243,000,000	17,000,000	0
Production and ad valorem taxes									118,000,000	27,000,000	11,000,000
Depreciation, depletion and amortization									720,000,000	134,000,000	46,000,000
Impairment of oil and natural gas properties									790,000,000
General and administrative expenses									67,000,000	38,000,000	23,000,000
Merger and integration expense										18,000,000
Asset retirement obligation accretion									5,000,000	1,000,000	0
Other operating expense									4,000,000	3,000,000
Total costs and expenses									2,151,000,000	311,000,000	91,000,000
Income from operations									57,000,000	260,000,000	120,000,000
Other income (expense):
Interest expense, net									(51,000,000)	(24,000,000)	(5,000,000)
Other (expense) income, net									2,000,000	90,000,000	12,000,000
Gain on derivative instruments, net									(52,000,000)	(68,000,000)	(1,000,000)
Gain (loss) on revaluation of investment									5,000,000	(1,000,000)
Loss on extinguishment of debt									0
Income from subsidiaries									0	0	0
Total other income (expense), net									(96,000,000)	(3,000,000)	6,000,000
Income (loss) before income taxes									(39,000,000)	257,000,000	126,000,000
Provision for (benefit from) income taxes									(33,000,000)	(73,000,000)	0
Net income (loss)									(6,000,000)	330,000,000	126,000,000
Net income (loss) attributable to non-controlling interest									266,000,000	119,000,000	0
Net income (loss) attributable to Diamondback Energy, Inc.									(272,000,000)	211,000,000	126,000,000
Non-Guarantor Subsidiaries | Reportable Legal Entities | Oil sales
Revenues:
Revenues									1,318,000,000	87,000,000	0
Non-Guarantor Subsidiaries | Reportable Legal Entities | Natural gas sales
Revenues:
Revenues									31,000,000	5,000,000	0
Non-Guarantor Subsidiaries | Reportable Legal Entities | Natural gas liquid sales
Revenues:
Revenues									114,000,000	9,000,000	0
Non-Guarantor Subsidiaries | Reportable Legal Entities | Royalty income
Revenues:
Revenues									293,000,000	283,000,000	160,000,000
Non-Guarantor Subsidiaries | Reportable Legal Entities | Midstream services
Revenues:
Revenues									434,000,000	172,000,000	39,000,000
Costs and expenses:
Cost of goods and services sold									170,000,000	72,000,000	11,000,000
Non-Guarantor Subsidiaries | Reportable Legal Entities | Gathering and transportation
Costs and expenses:
Cost of goods and services sold									$ 34,000,000	$ 1,000,000	$ 0