Derivative Instruments and Hedging Activities (Details 2) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Gain (loss) reclassified from accumulated OCI into income	$ 95	$ (205)	$ 322	$ (341)
Foreign Exchange Contract [Member] | Cost of revenue - Oilfield Services [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Gain (loss) reclassified from accumulated OCI into income	89	(200)	314	(335)
Foreign Exchange Contract [Member] | Research and Development Expense [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Gain (loss) reclassified from accumulated OCI into income	$ 6	$ (5)	$ 8	$ (6)