Properties, Plant and Equipment (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 182,186	$ 188,396	$ 183,173
Dry hole expense related to prior years expenditures, net	175	1,573	371
Accretion expense	749	715	882
Impairment charges	3,186	4,066	1,274
Australia [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	53,962	49,205	41,012
Nigeria [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 17,922	$ 18,773	$ 19,214