Properties, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Properties, Plant and Equipment
Gross Investment at Cost	$ 296,433	[1]	$ 263,481	[1]	$ 233,432	[1]
Net Investment	164,829	[1]	141,348	[1]	122,608	[1]
Additions at Cost	38,122	[1],[2],[3]	34,015	[1],[2],[3]	32,391	[1],[2],[3]
Depreciation Expense	14,186	[1],[4]	13,413	[1],[4]	12,911	[1],[4]
United States [Member]
Properties, Plant and Equipment
Gross Investment at Cost	117,364	[1]	108,659	[1]	100,185	[1]
Net Investment	56,506	[1]	52,087	[1]	47,056	[1]
Additions at Cost	10,063	[1],[2],[3]	10,124	[1],[2],[3]	16,221	[1],[2],[3]
Depreciation Expense	5,478	[1],[4]	5,085	[1],[4]	4,984	[1],[4]
International [Member]
Properties, Plant and Equipment
Gross Investment at Cost	179,069	[1]	154,822	[1]	133,247	[1]
Net Investment	108,323	[1]	89,261	[1]	75,552	[1]
Additions at Cost	28,059	[1],[2],[3]	23,891	[1],[2],[3]	16,170	[1],[2],[3]
Depreciation Expense	8,708	[1],[4]	8,328	[1],[4]	7,927	[1],[4]
Upstream [Member]
Properties, Plant and Equipment
Gross Investment at Cost	259,178	[1]	227,707	[1]	200,164	[1]
Net Investment	145,931	[1]	123,227	[1]	106,004	[1]
Additions at Cost	35,571	[1],[2],[3]	29,554	[1],[2],[3]	30,126	[1],[2],[3]
Depreciation Expense	12,748	[1],[4]	11,917	[1],[4]	11,460	[1],[4]
Upstream [Member] | United States [Member]
Properties, Plant and Equipment
Gross Investment at Cost	89,555	[1]	81,908	[1]	74,369	[1]
Net Investment	41,831	[1]	37,909	[1]	33,461	[1]
Additions at Cost	8,188	[1],[2],[3]	8,211	[1],[2],[3]	14,404	[1],[2],[3]
Depreciation Expense	4,412	[1],[4]	3,902	[1],[4]	3,870	[1],[4]
Upstream [Member] | International [Member]
Properties, Plant and Equipment
Gross Investment at Cost	169,623	[1]	145,799	[1]	125,795	[1]
Net Investment	104,100	[1]	85,318	[1]	72,543	[1]
Additions at Cost	27,383	[1],[2],[3]	21,343	[1],[2],[3]	15,722	[1],[2],[3]
Depreciation Expense	8,336	[1],[4]	8,015	[1],[4]	7,590	[1],[4]
Downstream [Member]
Properties, Plant and Equipment
Gross Investment at Cost	31,710	[1]	30,782	[1]	28,121	[1]
Net Investment	15,620	[1]	15,263	[1]	13,718	[1]
Additions at Cost	1,807	[1],[2],[3]	4,042	[1],[2],[3]	1,669	[1],[2],[3]
Depreciation Expense	1,140	[1],[4]	1,107	[1],[4]	1,108	[1],[4]
Downstream [Member] | United States [Member]
Properties, Plant and Equipment
Gross Investment at Cost	22,407	[1]	21,792	[1]	20,699	[1]
Net Investment	11,481	[1]	11,333	[1]	10,723	[1]
Additions at Cost	1,154	[1],[2],[3]	1,498	[1],[2],[3]	1,226	[1],[2],[3]
Depreciation Expense	780	[1],[4]	799	[1],[4]	776	[1],[4]
Downstream [Member] | International [Member]
Properties, Plant and Equipment
Gross Investment at Cost	9,303	[1]	8,990	[1]	7,422	[1]
Net Investment	4,139	[1]	3,930	[1]	2,995	[1]
Additions at Cost	653	[1],[2],[3]	2,544	[1],[2],[3]	443	[1],[2],[3]
Depreciation Expense	360	[1],[4]	308	[1],[4]	332	[1],[4]
All Other Segments [Member]
Properties, Plant and Equipment
Gross Investment at Cost	5,545	[1],[5]	4,992	[1],[5]	5,147	[1],[5]
Net Investment	3,278	[1],[5]	2,858	[1],[5]	2,886	[1],[5]
Additions at Cost	744	[1],[2],[3],[5]	419	[1],[2],[3],[5]	596	[1],[2],[3],[5]
Depreciation Expense	298	[1],[4],[5]	389	[1],[4],[5]	343	[1],[4],[5]
All Other Segments [Member] | United States [Member]
Properties, Plant and Equipment
Gross Investment at Cost	5,402	[1],[5]	4,959	[1],[5]	5,117	[1],[5]
Net Investment	3,194	[1],[5]	2,845	[1],[5]	2,872	[1],[5]
Additions at Cost	721	[1],[2],[3],[5]	415	[1],[2],[3],[5]	591	[1],[2],[3],[5]
Depreciation Expense	286	[1],[4],[5]	384	[1],[4],[5]	338	[1],[4],[5]
All Other Segments [Member] | International [Member]
Properties, Plant and Equipment
Gross Investment at Cost	143	[1],[5]	33	[1],[5]	30	[1],[5]
Net Investment	84	[1],[5]	13	[1],[5]	14	[1],[5]
Additions at Cost	23	[1],[2],[3],[5]	4	[1],[2],[3],[5]	5	[1],[2],[3],[5]
Depreciation Expense	$ 12	[1],[4],[5]	$ 5	[1],[4],[5]	$ 5	[1],[4],[5]

[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.

[2] Net of dry hole expense related to prior years’ expenditures of $89, $80 and $45 in 2013, 2012 and 2011, respectively.

[3] Includes properties acquired with the acquisition of Atlas Energy, Inc., in 2011.

[4] Depreciation expense includes accretion expense of $627, $629 and $628 in 2013, 2012 and 2011, respectively.

[5] Primarily mining operations, power and energy services, real estate assets and management information systems.