Business Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenue:
Revenue	$ 7,348	$ 6,974
Operating income (loss):
Operating income (loss)	970	(98)
Interest expense, net of interest income	(93)	(71)
Other, net	(31)	(14)
Income (loss) from continuing operations before income taxes	846	(183)
Completion and Production
Revenue:
Revenue	4,420	4,100
Operating income (loss):
Operating income (loss)	661	615
Drilling and Evaluation
Revenue:
Revenue	2,928	2,874
Operating income (loss):
Operating income (loss)	398	407
Total operations
Revenue:
Revenue	7,348	6,974
Operating income (loss):
Operating income (loss)	1,059	1,022
Corporate and other
Operating income (loss):
Operating income (loss)	$ (89)	$ (1,120)