Business Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenue:
Revenue	$ 6,974	$ 6,868
Operating income:
Operating income (loss)	(98)	1,023
Interest expense, net of interest income	(71)	(74)
Other, net	(14)	(7)
Income (loss) from continuing operations before income taxes	(183)	942
Completion and Production
Revenue:
Revenue	4,100	4,290
Operating income:
Operating income (loss)	615	1,036
Drilling and Evaluation
Revenue:
Revenue	2,874	2,578
Operating income:
Operating income (loss)	407	368
Total operations
Revenue:
Revenue	6,974	6,868
Operating income:
Operating income (loss)	1,022	1,404
Corporate and other
Operating income:
Operating income (loss)	$ (1,120)	$ (381)