Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenue		$ 6,520	$ 10,248
Pretax operating income		901	1,993
Interest		133	82
Restructuring and other charges		0	439
Income before Taxes		622	1,294
Operating Segments
Segment Reporting Information [Line Items]
Interest income		6	5
Interest		13	6
Operating Segments | Reservoir Characterization
Segment Reporting Information [Line Items]
Revenue		1,747	2,655
Pretax operating income		331	672
Operating Segments | Drilling
Segment Reporting Information [Line Items]
Revenue		2,493	3,922
Pretax operating income		371	778
Operating Segments | Production
Segment Reporting Information [Line Items]
Revenue		2,348	3,705
Pretax operating income		208	544
Eliminations & other
Segment Reporting Information [Line Items]
Revenue		(68)	(34)
Pretax operating income		(9)	(1)
Material Reconciling Items
Segment Reporting Information [Line Items]
Corporate & other	[1]	(172)	(192)
Interest income	[2]	13	8
Interest	[3]	$ (120)	(76)
Restructuring and other charges	[4]		$ (439)

[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 ($6 million in 2016; $5 million in 2015).

[3] Interest expense excludes amounts which are included in the segments’ income ($13 million in 2016; $6 million in 2015).

[4] See Note 2 – Charges and Credits.