Business Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenue:
Revenue	$ 7,111	$ 6,548	$ 21,213	$ 17,765
Operating income:
Operating income	954	1,332	3,178	3,307
Interest expense, net of interest income	(71)	(62)	(225)	(194)
Other, net	(6)	(9)	(30)	(18)
Income from continuing operations before income taxes	877	1,261	2,923	3,095
Completion and Production
Revenue:
Revenue	4,293	4,025	13,043	10,815
Operating income:
Operating income	591	1,068	2,541	2,646
Drilling and Evaluation
Revenue:
Revenue	2,818	2,523	8,170	6,950
Operating income:
Operating income	430	369	1,191	923
Total operations
Operating income:
Operating income	1,021	1,437	3,732	3,569
Corporate and other
Operating income:
Operating income	$ (67)	$ (105)	$ (554)	$ (262)