Segment Information - Financial Data by Operating Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 1,159	$ 1,580	$ 3,346	$ 4,812
Net Income (Loss) attributable to Hess Corporation	(243)	(212)	(2,996)	(186)
Depreciation, depletion and amortization	518	544	1,588	1,536
Impairment			2,126
Provision (benefit) for income taxes	5	116	(83)	342
Capital Expenditures	367	736	1,540	2,072
Assets	18,969		18,969		$ 21,782
Exploration and Production
Segment Reporting Information [Line Items]
Sales and other operating revenues	1,159	1,580	3,346	4,812
Midstream
Segment Reporting Information [Line Items]
Sales and other operating revenues	0	0	0	0
Operating Segments | Exploration and Production
Segment Reporting Information [Line Items]
Sales and other operating revenues	1,159	1,580	3,346	4,812
Net Income (Loss) attributable to Hess Corporation	(182)	(60)	(2,802)	117
Depreciation, depletion and amortization	478	507	1,469	1,430
Impairment			2,126
Provision (benefit) for income taxes	6	116	(82)	342
Capital Expenditures	301	624	1,338	1,764
Assets	14,005		14,005		16,790
Operating Segments | Midstream
Segment Reporting Information [Line Items]
Sales and other operating revenues	264	215	825	595
Net Income (Loss) attributable to Hess Corporation	56	39	168	111
Depreciation, depletion and amortization	40	36	117	105
Impairment			0
Provision (benefit) for income taxes	1	0	5	0
Capital Expenditures	66	112	202	308
Assets	3,594		3,594		3,499
Corporate, Interest and Other
Segment Reporting Information [Line Items]
Net Income (Loss) attributable to Hess Corporation	(117)	(191)	(362)	(414)
Depreciation, depletion and amortization	0	1	2	1
Impairment			0
Provision (benefit) for income taxes	(2)	0	(6)	0
Capital Expenditures	0	0	0	0
Assets	1,370		1,370		$ 1,493
Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	(264)	(215)	(825)	(595)
Net Income (Loss) attributable to Hess Corporation	0	0	0	0
Depreciation, depletion and amortization	0	0	0	0
Impairment			0
Provision (benefit) for income taxes	0	0	0	0
Capital Expenditures	0	0	0	0
Eliminations | Exploration and Production
Segment Reporting Information [Line Items]
Sales and other operating revenues	0	0	0	0
Eliminations | Midstream
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 264	$ 215	$ 825	$ 595