Disclosures about Segments and Related Information (Details) (USD $) In Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Earnings After Income Tax	$ 10,680		$ 7,560		$ 21,330		$ 13,860
Sales And Other Operating Revenue	121,394	[1],[2]	89,693	[1],[2]	230,645	[1],[2]	176,730	[1],[2]
Upstream U.S. [Member]
Earnings After Income Tax	1,449		865		2,728		1,956
Sales And Other Operating Revenue	3,629	[2]	1,081	[2]	6,915	[2]	2,347	[2]
Intersegment Revenue	2,598		1,944		4,957		4,088
Upstream Non-U.S. [Member]
Earnings After Income Tax	7,092		4,471		14,488		9,194
Sales And Other Operating Revenue	8,705	[2]	5,950	[2]	17,583	[2]	12,258	[2]
Intersegment Revenue	12,873		9,314		25,178		18,866
Downstream U.S. [Member]
Earnings After Income Tax	734		440		1,428		380
Sales And Other Operating Revenue	32,038	[2]	23,700	[2]	59,575	[2]	45,513	[2]
Intersegment Revenue	5,115		3,650		9,645		7,034
Downstream Non-U.S. [Member]
Earnings After Income Tax	622		780		1,027		877
Sales And Other Operating Revenue	65,960	[2]	49,883	[2]	125,151	[2]	98,740	[2]
Intersegment Revenue	19,632		12,254		36,133		25,211
Chemical U.S. [Member]
Earnings After Income Tax	625		685		1,294		1,224
Sales And Other Operating Revenue	4,129	[2]	3,425	[2]	7,776	[2]	6,822	[2]
Intersegment Revenue	3,502		2,614		6,318		4,922
Chemical Non-U.S. [Member]
Earnings After Income Tax	696		683		1,543		1,393
Sales And Other Operating Revenue	6,926	[2]	5,649	[2]	13,634	[2]	11,042	[2]
Intersegment Revenue	2,685		2,117		5,135		4,154
All Other [Member]
Earnings After Income Tax	(538)		(364)		(1,178)		(1,164)
Sales And Other Operating Revenue	7	[2]	5	[2]	11	[2]	8	[2]
Intersegment Revenue	62		68		126		138
Corporate Total [Member]
Earnings After Income Tax	$ 10,680		$ 7,560		$ 21,330		$ 13,860

[1] Sales-based taxes included in sales and other operating revenue for the three months ended June 30, 2011, and 2010, were $8,613 million and $6,946 million, respectively, and for the six months ended June 30, 2011, and 2010, were $16,529 million and $13,761 million, respectively.

[2] Includes sales-based taxes