Business Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue:
Revenue	$ 8,701	$ 7,472	$ 24,100	$ 21,763
Operating income (loss):
Operating income	1,634	1,108	3,798	1,994
Interest expense, net of interest income	(96)	(91)	(283)	(233)
Other, net	12	(12)	(43)	(37)
Income from continuing operations before income taxes	1,550	1,005	3,472	1,724
Completion and Production
Revenue:
Revenue	5,420	4,501	14,782	12,964
Operating income (loss):
Operating income	1,071	763	2,619	2,110
Drilling and Evaluation
Revenue:
Revenue	3,281	2,971	9,318	8,799
Operating income (loss):
Operating income	451	450	1,263	1,272
Total operations
Revenue:
Revenue	8,701	7,472	24,100	21,763
Operating income (loss):
Operating income	1,522	1,213	3,882	3,382
Corporate and other
Operating income (loss):
Operating income	$ 112	$ (105)	$ (84)	$ (1,388)