Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2019		Jun. 30, 2018		Jun. 30, 2019		Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenue		$ 8,269		$ 8,303		$ 16,149		$ 16,131
Income Before Taxes		593		547		1,101		1,190
Pretax segment operating income		968		1,094		1,876		2,068
Interest expense		156		144		302		287
Reservoir Characterization
Segment Reporting Information [Line Items]
Revenue		1,649		1,640		3,192		3,199
Drilling
Segment Reporting Information [Line Items]
Revenue		2,421		2,234		4,808		4,360
Production
Segment Reporting Information [Line Items]
Revenue		3,077		3,253		5,967		6,209
Cameron
Segment Reporting Information [Line Items]
Revenue		1,237		1,295		2,412		2,605
Operating Segments
Segment Reporting Information [Line Items]
Revenue		8,269		8,303		16,149		16,131
Interest income		2		1		5		4
Interest expense		10		9		20		21
Operating Segments | Reservoir Characterization
Segment Reporting Information [Line Items]
Revenue		1,649		1,640		3,192		3,199
Income Before Taxes		326		350		619		656
Operating Segments | Drilling
Segment Reporting Information [Line Items]
Revenue		2,421		2,234		4,808		4,360
Income Before Taxes		300		289		608		582
Operating Segments | Production
Segment Reporting Information [Line Items]
Revenue		3,077		3,253		5,967		6,209
Income Before Taxes		235		316		453		533
Operating Segments | Cameron
Segment Reporting Information [Line Items]
Revenue		1,237		1,295		2,412		2,605
Income Before Taxes		156		166		292		332
Eliminations & other
Segment Reporting Information [Line Items]
Revenue		(115)		(119)		(230)		(242)
Income Before Taxes		(49)		(27)		(96)		(35)
Corporate & other	[1]	(238)		(239)		(511)		(464)
Interest income		9	[2]	11	[2]	18	[3]	36	[3]
Interest expense		$ (146)	[4]	(135)	[4]	$ (282)	[5]	(266)	[5]
Charges and credits	[6]			$ (184)				$ (184)

[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 ($2 million in 2019; $1 million in 2018).

[3] Interest income excludes amounts which are included in the segments’ income ($5 million in 2019; $4 million in 2018).

[4] Interest expense excludes amounts which are included in the segments’ income ($10 million in 2019; $9 million in 2018).

[5] Interest expense excludes amounts which are included in the segments’ income ($20 million in 2019; $21 million in 2018).

[6] See Note 2 – Charges and Credits.