Properties, Plant and Equipment (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 164,829	[1]	$ 141,348	[1]	$ 122,608	[1]
Dry hole expense related to prior years expenditures, net	89		80		45
Accretion expense	627		629		628
Australia [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	31,464		21,770		12,423
Nigeria [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 18,429		$ 17,485		$ 15,601

[1] Other than the United States, Australia and Nigeria, no other country accounted for 10 percent or more of the company’s net properties, plant and equipment (PP&E) in 2013. Australia had $31,464, $21,770 and $12,423 in 2013, 2012, and 2011, respectively. Nigeria had PP&E of $18,429, $17,485 and $15,601 for 2013, 2012 and 2011, respectively.