Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenue		$ 7,829	$ 6,894
Income Before Taxes		643	334
Pretax operating income		974	757
Interest expense		143	139
Reservoir Characterization
Segment Reporting Information [Line Items]
Revenue		1,556	1,618
Drilling
Segment Reporting Information [Line Items]
Revenue		2,126	1,985
Production
Segment Reporting Information [Line Items]
Revenue		2,959	2,187
Cameron
Segment Reporting Information [Line Items]
Revenue		1,310	1,229
Operating Segments
Segment Reporting Information [Line Items]
Revenue		7,829	6,894
Interest income		3	5
Interest expense		12	13
Operating Segments | Reservoir Characterization
Segment Reporting Information [Line Items]
Revenue		1,556	1,618
Income Before Taxes		307	281
Operating Segments | Drilling
Segment Reporting Information [Line Items]
Revenue		2,126	1,985
Income Before Taxes		293	229
Operating Segments | Production
Segment Reporting Information [Line Items]
Revenue		2,959	2,187
Income Before Taxes		216	110
Operating Segments | Cameron
Segment Reporting Information [Line Items]
Revenue		1,310	1,229
Income Before Taxes		166	162
Eliminations & other
Segment Reporting Information [Line Items]
Revenue		(122)	(125)
Income Before Taxes		(8)	(25)
Corporate & other	[1]	(225)	(239)
Interest income	[2]	25	24
Interest expense	[3]	$ (131)	(126)
Charges and credits	[4]		$ (82)

[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 ($3 million in 2018; $5 million in 2017).

[3] Interest expense excludes amounts which are included in the segments’ income ($12 million in 2018; $13 million in 2017).

[4] See Note 2 – Charges and Credits.