Properties, Plant and Equipment (Details Textual) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment	[1]	$ 188,396	$ 183,173	$ 164,829
Dry hole expense related to prior years expenditures, net		1,573	371	89
Accretion expense		715	882	627
Impairment charges		4,066	1,274	382
Australia [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment		49,205	41,012	31,464
Nigeria [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment		$ 18,773	$ 19,214	$ 18,429

[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 2015. Australia had $49,205, $41,012 and $31,464 in 2015, 2014, and 2013, respectively. Nigeria had PP&E of $18,773, $19,214 and $18,429 for 2015, 2014 and 2013, respectively.