Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2018		Sep. 30, 2017		Sep. 30, 2018		Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenue		$ 8,504		$ 7,905		$ 24,636		$ 22,261
Income Before Taxes		787		677		1,976		1,027
Pretax operating income		1,152		1,059		3,220		2,766
Interest expense		147		142		434		422
Reservoir Characterization
Segment Reporting Information [Line Items]
Revenue		1,673				4,865
Drilling
Segment Reporting Information [Line Items]
Revenue		2,429				6,789
Production
Segment Reporting Information [Line Items]
Revenue		3,252				9,468
Cameron
Segment Reporting Information [Line Items]
Revenue		1,298				3,902
Operating Segments
Segment Reporting Information [Line Items]
Revenue		8,504		7,905		24,636		22,261
Interest income		2		4		7		15
Interest expense		8		13		29		39
Operating Segments | Reservoir Characterization
Segment Reporting Information [Line Items]
Revenue		1,673		1,771		4,865		5,148
Income Before Taxes		373		311		1,030		891
Operating Segments | Drilling
Segment Reporting Information [Line Items]
Revenue		2,429		2,120		6,789		6,212
Income Before Taxes		339		301		921		832
Operating Segments | Production
Segment Reporting Information [Line Items]
Revenue		3,252		2,876		9,468		7,559
Income Before Taxes		320		283		851		614
Operating Segments | Cameron
Segment Reporting Information [Line Items]
Revenue		1,298		1,297		3,902		3,791
Income Before Taxes		148		194		481		530
Eliminations & other
Segment Reporting Information [Line Items]
Revenue		(148)		(159)		(388)		(449)
Income Before Taxes		(28)		(30)		(63)		(101)
Corporate & other	[1]	(234)		(234)		(699)		(715)
Interest income		8	[2]	30	[2]	44	[3]	82	[3]
Interest expense		$ (139)	[4]	(129)	[4]	(405)	[5]	(383)	[5]
Charges and credits	[6]			$ (49)		$ (184)		$ (723)

[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 2018; $4 million in 2017).

[3] Interest income excludes amounts which are included in the segments’ income ($7 million in 2018; $15 million in 2017).

[4] Interest expense excludes amounts which are included in the segments’ income ($8 million in 2018; $13 million in 2017).

[5] Interest expense excludes amounts which are included in the segments’ income ($29 million in 2018; $39 million in 2017).

[6] See Note 2 – Charges and Credits.