PROPERTY, PLANT, EQUIPMENT AND DEVELOPMENT COSTS, NET (Schedule of PPE) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, plant, equipment and development costs	$ 29,650	$ 25,975
Accumulated depreciation, depletion and amortization	(8,651)	(7,526)
Property, plant, equipment and development costs, net	20,999	18,449
Proven and probable reserves [Member]
Property, Plant and Equipment [Line Items]
Property, plant, equipment and development costs	4,630	4,572
Value beyond proven and probable reserves (VBPP) [Member]
Property, Plant and Equipment [Line Items]
Property, plant, equipment and development costs	1,067	1,071
Development and other [Member]
Property, Plant and Equipment [Line Items]
Property, plant, equipment and development costs	3,821	3,447
Buildings and infrastructure [Member]
Property, Plant and Equipment [Line Items]
Property, plant, equipment and development costs	3,811	3,151
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, equipment and development costs	9,472	8,171
Mobile equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, equipment and development costs	3,447	2,859
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant, equipment and development costs	$ 3,402	$ 2,704