Property, Plant and Equipment, Net (Details) (USD $) In Millions, unless otherwise specified			9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2012 Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 23,709	$ 23,055
Accumulated depreciation and amortization	(7,146)	(6,888)
Net property, plant and equipment	16,563	16,167
Construction work-in-progress	1,309	1,207
Total property, plant and equipment, net	$ 17,872	$ 17,374
Property, Plant and Equipment, Depreciable Life			5 years	80 years