Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Segment Reporting Information [Line Items]
Revenue	$ 11,239		$ 10,570
Income before taxes	2,077		1,617
Operating Segments
Segment Reporting Information [Line Items]
Revenue	11,239		10,570
Income before taxes	2,368		1,965
Operating Segments | Reservoir Characterization
Segment Reporting Information [Line Items]
Revenue	2,852		2,801
Income before taxes	779		729
Operating Segments | Drilling
Segment Reporting Information [Line Items]
Revenue	4,331		4,062
Income before taxes	881		725
Operating Segments | Production
Segment Reporting Information [Line Items]
Revenue	4,116		3,759
Income before taxes	737		555
Eliminations & other
Segment Reporting Information [Line Items]
Revenue	(60)		(52)
Income before taxes	(29)		(44)
Corporate & other
Segment Reporting Information [Line Items]
Income before taxes	(201)	[1]	(169)	[1]
Interest income
Segment Reporting Information [Line Items]
Income before taxes	7	[2]	6	[2]
Interest expense
Segment Reporting Information [Line Items]
Income before taxes	(97)	[3]	(93)	[3]
Charges & credits
Segment Reporting Information [Line Items]
Income before taxes			$ (92)	[4]

[1] Comprised principally of certain corporate expenses not allocated to the segments, interest on postretirement medical benefits, stock-based compensation costs, amortization expense associated with certain intangible and other nonoperating items.

[2] Interest income excludes amounts which are included in the segments’ income ($5 million in 2014; $— million in 2013).

[3] Interest expense excludes amounts which are included in the segments’ income ($6 million in 2014; $5 million in 2013).

[4] See Note 2 – Charges and Credits.