Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2020		Sep. 30, 2019		Sep. 30, 2020		Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenue		$ 5,258		$ 8,541		$ 18,069		$ 24,689
Income (Loss) Before Taxes		(54)		(11,971)		(11,769)		(10,870)
Pretax segment operating income		575		1,096		1,747		2,972
Interest expense		138		160		419		462
Reservoir Characterization
Segment Reporting Information [Line Items]
Revenue		1,010		1,651		3,372		4,669
Drilling
Segment Reporting Information [Line Items]
Revenue		1,519		2,469		5,540		7,275
Production
Segment Reporting Information [Line Items]
Revenue		1,801		3,153		6,119		9,120
Cameron
Segment Reporting Information [Line Items]
Revenue		965		1,363		3,235		3,949
Operating Segments
Segment Reporting Information [Line Items]
Revenue		5,258		8,541		18,069		24,689
Interest income				1		1		6
Interest expense		7		9		22		29
Operating Segments | Reservoir Characterization
Segment Reporting Information [Line Items]
Revenue		1,010		1,651		3,372		4,669
Income (Loss) Before Taxes		169		360		538		959
Operating Segments | Drilling
Segment Reporting Information [Line Items]
Revenue		1,519		2,469		5,540		7,275
Income (Loss) Before Taxes		144		306		594		914
Operating Segments | Production
Segment Reporting Information [Line Items]
Revenue		1,801		3,153		6,119		9,120
Income (Loss) Before Taxes		227		288		464		740
Operating Segments | Cameron
Segment Reporting Information [Line Items]
Revenue		965		1,363		3,235		3,949
Income (Loss) Before Taxes		60		173		262		486
Eliminations & other
Segment Reporting Information [Line Items]
Revenue		(37)		(95)		(197)		(324)
Income (Loss) Before Taxes		(25)		(31)		(111)		(127)
Corporate & other	[1]	(151)		(231)		(548)		(742)
Interest income		3	[2]	7	[2]	25	[3]	25	[3]
Interest expense		(131)	[4]	(151)	[4]	(397)	[5]	(433)	[5]
Charges and credits	[6]	$ (350)		$ (12,692)		$ (12,596)		$ (12,692)

[1] Comprised principally of certain corporate expenses not allocated to the segments, stock-based compensation costs, amortization expense associated with certain intangible assets, certain centrally managed initiatives and other nonoperating items.

[2] Interest income excludes amounts which are included in the segments’ income ($- million in 2020; $1 million in 2019).

[3] Interest income excludes amounts which are included in the segments’ income ($1 million in 2020; $6 million in 2019).

[4] Interest expense excludes amounts which are included in the segments’ income ($7 million in 2020; $9 million in 2019).

[5] Interest expense excludes amounts which are included in the segments’ income ($22 million in 2020; $29 million in 2019).

[6] See Note 2 – Charges and Credits.