Segment Information (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Segment Reporting Information [Line Items]
Revenue	$ 9,621	$ 5,937	$ 18,337	$ 11,534
Income before taxes	1,498	993	2,736	1,882
Oilfield Services
Segment Reporting Information [Line Items]
Revenue	8,990	5,937	17,111	11,534
Income before taxes	1,750	1,120	3,205	2,155
Reservoir Characterization [Member]
Segment Reporting Information [Line Items]
Revenue	2,461	2,302	4,654	4,549
Income before taxes	602	554	1,062	1,123
Drilling
Segment Reporting Information [Line Items]
Revenue	3,458	1,524	6,662	2,979
Income before taxes	538	286	1,005	560
Reservoir Production [Member]
Segment Reporting Information [Line Items]
Revenue	3,060	2,088	5,777	3,971
Income before taxes	613	249	1,141	408
Eliminations and other
Segment Reporting Information [Line Items]
Revenue	11	23	18	35
Income before taxes	(3)	31	(3)	64
Distribution
Segment Reporting Information [Line Items]
Revenue	637		1,238
Income before taxes	24		46
Eliminations
Segment Reporting Information [Line Items]
Revenue	(6)		(12)
Segment Results
Segment Reporting Information [Line Items]
Revenue	631		1,226
Income before taxes	24		46
Corporate and other
Segment Reporting Information [Line Items]
Income before taxes	(135)	(89)	(278)	(170)
Interest income
Segment Reporting Information [Line Items]
Income before taxes	10	11	19	24
Interest expense
Segment Reporting Information [Line Items]
Income before taxes	(69)	(49)	(140)	(92)
Charges
Segment Reporting Information [Line Items]
Income before taxes	$ (82)		$ (116)	$ (35)