Disclosures About Segments And Related Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Segment Reporting Information [Line Items]
Earnings after income tax	$ 6,860		$ 15,910		$ 16,360		$ 25,360
Sales and other operating revenue	102,853	[1],[2]	112,745	[1],[2]	206,681	[1],[2]	231,934	[1],[2]
Upstream United States [Member]
Segment Reporting Information [Line Items]
Earnings after income tax	1,096		678		1,955		1,688
Sales and other operating revenue	3,020	[1]	2,607	[1]	6,100	[1]	5,574	[1]
Intersegment revenue	2,034		2,111		4,309		4,603
Upstream Non-U.S. [Member]
Segment Reporting Information [Line Items]
Earnings after income tax	5,209		7,680		11,387		14,472
Sales and other operating revenue	6,953	[1]	7,059	[1]	13,355	[1]	14,955	[1]
Intersegment revenue	11,205		11,896		22,592		24,066
Downstream United States [Member]
Segment Reporting Information [Line Items]
Earnings after income tax	248		834		1,287		1,437
Sales and other operating revenue	29,965	[1]	30,461	[1]	60,963	[1]	61,370	[1]
Intersegment revenue	5,086		5,282		10,256		10,792
Downstream Non-U.S. [Member]
Segment Reporting Information [Line Items]
Earnings after income tax	148		5,812	[3]	654		6,795	[3]
Sales and other operating revenue	53,480	[1]	62,809	[1]	106,887	[1]	129,827	[1]
Intersegment revenue	11,647		14,737		25,164		31,906
Chemical United States [Member]
Segment Reporting Information [Line Items]
Earnings after income tax	515		494		1,267		927
Sales and other operating revenue	3,723	[1]	3,747	[1]	7,606	[1]	7,674	[1]
Intersegment revenue	2,959		3,000		6,186		6,128
Chemical Non-U.S. [Member]
Segment Reporting Information [Line Items]
Earnings after income tax	241		955	[3]	626		1,223	[3]
Sales and other operating revenue	5,705	[1]	6,055	[1]	11,755	[1]	12,523	[1]
Intersegment revenue	1,993		2,580		4,055		5,273
All Other [Member]
Segment Reporting Information [Line Items]
Earnings after income tax	(597)		(543)		(816)		(1,182)
Sales and other operating revenue	7	[1]	7	[1]	15	[1]	11	[1]
Intersegment revenue	$ 71		$ 67		$ 138		$ 137

[1] Includes sales-based taxes

[2] Sales-based taxes included in sales and other operating revenue for the three months ended June 30, 2013, and 2012, were $7,552 million and $8,027 million, respectively, and for the six months ended June 30, 2013, and 2012, were $15,044 million and $16,520 million, respectively.

[3] 2012 periods include gain associated with the Japan restructuring of $5.3 billion in the non-U.S. Downstream and $0.6 billion in the non-U.S. Chemical segments.