Segment Information (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Segment Reporting Information [Line Items]
Revenue	$ 10,229	$ 6,845	$ 28,566	$ 18,379
Income before taxes	1,717	1,940	4,453	3,822
Oilfield Services [Member]
Segment Reporting Information [Line Items]
Revenue	9,546	6,646	26,658	18,180
Income before taxes	1,931	1,219	5,136	3,373
Reservoir Characterization [Member]
Segment Reporting Information [Line Items]
Revenue	2,488	2,282	7,142	6,831
Income before taxes	610	525	1,672	1,647
Drilling [Member]
Segment Reporting Information [Line Items]
Revenue	3,676	2,049	10,339	5,028
Income before taxes	613	307	1,618	867
Reservoir Production [Member]
Segment Reporting Information [Line Items]
Revenue	3,373	2,300	9,150	6,271
Income before taxes	707	378	1,848	786
Eliminations and other [Member]
Segment Reporting Information [Line Items]
Revenue	9	15	27	50
Income before taxes	1	9	(2)	73
Distribution [Member]
Segment Reporting Information [Line Items]
Revenue	698	199	1,935	199
Income before taxes	31	9	77	9
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(15)		(27)
Segment Results [Member]
Segment Reporting Information [Line Items]
Revenue	683	199	1,908	199
Income before taxes	31	9	77	9
Corporate and other [Member]
Segment Reporting Information [Line Items]
Income before taxes	(158)	(83)	(437)	(251)
Interest income [Member]
Segment Reporting Information [Line Items]
Income before taxes	9	10	28	34
Interest expense [Member]
Segment Reporting Information [Line Items]
Income before taxes	(69)	(51)	(208)	(144)
Charges and Credits [Member]
Segment Reporting Information [Line Items]
Income before taxes	$ (27)	$ 836	$ (143)	$ 801