Business Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Revenue:
Revenue	$ 7,050		$ 7,348
Operating income (loss):
Operating income (loss)	(548)		970
Restructuring Charges	1,208	[1]	0	[1]
Interest expense, net of interest income	(106)		(93)
Other, net	(224)		(31)
Income (loss) from continuing operations before income taxes	(878)		846
Completion and Production
Revenue:
Revenue	4,246		4,420
Operating income (loss):
Operating income (loss)	462		661
Restructuring Charges	510
Drilling and Evaluation
Revenue:
Revenue	2,804		2,928
Operating income (loss):
Operating income (loss)	306		398
Restructuring Charges	638
Total operations
Revenue:
Revenue	7,050		7,348
Operating income (loss):
Operating income (loss)	768		1,059
Corporate and other
Operating income (loss):
Operating income (loss)	(108)		(89)
Restructuring Charges	$ 60

[1] (a) Includes $510 million attributable to Completion and Production, $638 million attributable to Drilling and Evaluation, and $60 million attributable to Corporate and other during the three months ended March 31, 2015.