Business Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenue:
Revenue	$ 7,234	$ 5,935	$ 14,102	$ 11,217
Operating income:
Operating income	1,201	1,161	2,224	1,975
Interest expense, net of interest income	(80)	(63)	(154)	(132)
Other, net	(17)	(5)	(24)	(9)
Income from continuing operations before income taxes	1,104	1,093	2,046	1,834
Completion and Production
Revenue:
Revenue	4,460	3,618	8,750	6,790
Operating income:
Operating income	914	918	1,950	1,578
Drilling and Evaluation
Revenue:
Revenue	2,774	2,317	5,352	4,427
Operating income:
Operating income	393	324	761	554
Total operations
Operating income:
Operating income	1,307	1,242	2,711	2,132
Corporate and other
Operating income:
Operating income	$ (106)	$ (81)	$ (487)	$ (157)