Derivative Instruments and Hedging Activities (Details 1) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Foreign Exchange Contract [Member] | Fair Value Hedging [Member] | Cost of revenue - Oilfield Services [Member]
Effect of derivative instruments designated as fair value hedges and not designated as hedges on the consolidated statement of income
Gain/(loss) recognized in income	$ 5		$ 7	$ (13)
Interest Rate Contract [Member] | Fair Value Hedging [Member] | Interest Expense [Member]
Effect of derivative instruments designated as fair value hedges and not designated as hedges on the consolidated statement of income
Gain/(loss) recognized in income	5	4	5	9
Fair Value Hedging [Member]
Effect of derivative instruments designated as fair value hedges and not designated as hedges on the consolidated statement of income
Gain/(loss) recognized in income	10	4	12	(4)
Foreign Exchange Contract [Member] | Nondesignated [Member] | Cost of revenue - Oilfield Services [Member]
Effect of derivative instruments designated as fair value hedges and not designated as hedges on the consolidated statement of income
Gain/(loss) recognized in income	36	(38)	15	(45)
Commodity Contract [Member] | Nondesignated [Member] | Cost of revenue - Oilfield Services [Member]
Effect of derivative instruments designated as fair value hedges and not designated as hedges on the consolidated statement of income
Gain/(loss) recognized in income	(3)	(1)	(2)	(2)
Nondesignated [Member]
Effect of derivative instruments designated as fair value hedges and not designated as hedges on the consolidated statement of income
Gain/(loss) recognized in income	33	(39)	13	(47)
Commodity Contract [Member]
Effect of derivative instruments designated as fair value hedges and not designated as hedges on the consolidated statement of income
Commodity forward contract outstanding	$ 41		$ 41