Segment Information - Financial Data by Operating Segment (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Net Income (Loss) attributable to Hess Corporation	$ (212)	$ (42)	$ (186)	$ (278)
Midstream Segment | Operating Segments
Segment Reporting Information [Line Items]
Net Income (Loss) attributable to Hess Corporation	39	30	111	88
Midstream Segment | Operating Segments | Pro Forma
Segment Reporting Information [Line Items]
Net Income (Loss) attributable to Hess Corporation		40		116
Exploration and Production | Operating Segments
Segment Reporting Information [Line Items]
Net Income (Loss) attributable to Hess Corporation	$ (60)	50	$ 117	56
Exploration and Production | Operating Segments | Pro Forma
Segment Reporting Information [Line Items]
Net Income (Loss) attributable to Hess Corporation		$ 40		$ 28