Segment Information - Financial Data by Operating Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 4,667	$ 6,495	$ 6,323
Net Income (Loss) Attributable to Hess Corporation	(3,093)	(408)	(282)
Interest Expense	468	380	399
Depreciation, Depletion and Amortization	2,074	2,122	1,883
Impairment	2,126
Provision (Benefit) for Income Taxes	(11)	461	335
Investment in Affiliates	212	222
Identifiable Assets	18,821	21,782
Capital Expenditures	1,931	2,992	2,180
Corporate, Interest and Other
Segment Reporting Information [Line Items]
Sales and other operating revenues	0	0	0
Net Income (Loss) Attributable to Hess Corporation	(482)	(605)	(453)
Interest Expense	373	317	339
Depreciation, Depletion and Amortization	2	3	8
Impairment	0
Provision (Benefit) for Income Taxes	(6)	86	(94)
Investment in Affiliates	0	0
Identifiable Assets	1,534	1,493
Capital Expenditures	0	0	0
Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	(1,092)	(848)	(713)
Net Income (Loss) Attributable to Hess Corporation	0	0	0
Interest Expense	0	0	0
Depreciation, Depletion and Amortization	0	0	0
Impairment	0
Provision (Benefit) for Income Taxes	0	0	0
Investment in Affiliates	0	0
Identifiable Assets	0	0
Capital Expenditures	0	0	0
Exploration and Production
Segment Reporting Information [Line Items]
Sales and other operating revenues	4,667	6,495	6,323
Exploration and Production | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	4,667	6,495	6,323
Net Income (Loss) Attributable to Hess Corporation	(2,841)	53	51
Interest Expense	0	0	0
Depreciation, Depletion and Amortization	1,915	1,977	1,748
Impairment	2,126
Provision (Benefit) for Income Taxes	(12)	375	391
Investment in Affiliates	104	114
Identifiable Assets	13,688	16,790
Capital Expenditures	1,678	2,576	1,909
Exploration and Production | Operating Segments | Pro Forma
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Hess Corporation			13
Exploration and Production | Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	0	0	0
Midstream
Segment Reporting Information [Line Items]
Sales and other operating revenues	0	0	0
Midstream | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	1,092	848	713
Net Income (Loss) Attributable to Hess Corporation	230	144	120
Interest Expense	95	63	60
Depreciation, Depletion and Amortization	157	142	127
Impairment	0
Provision (Benefit) for Income Taxes	7	0	38
Investment in Affiliates	108	108
Identifiable Assets	3,599	3,499
Capital Expenditures	253	416	271
Midstream | Operating Segments | Pro Forma
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Hess Corporation			158
Midstream | Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 1,092	$ 848	$ 713