Disclosures About Segments And Related Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Segment Reporting Information [Line Items]
Earnings after income tax	$ 7,870		$ 9,570		$ 24,230		$ 34,930
Sales and other operating revenue	108,390	[1],[2]	110,989	[1],[2]	314,818	[1],[2]	342,348	[1],[2]
Upstream United States [Member]
Segment Reporting Information [Line Items]
Earnings after income tax	1,050		633		3,005		2,321
Sales and other operating revenue	3,416	[1]	2,718	[1]	9,516	[1]	8,108	[1]
Intersegment Revenue	2,015		1,935		6,324		6,538
Upstream Non-U.S. [Member]
Segment Reporting Information [Line Items]
Earnings after income tax	5,663		5,340		17,050		19,812
Sales and other operating revenue	5,829	[1]	6,755	[1]	18,931	[1]	21,319	[1]
Intersegment Revenue	12,505		11,105		35,097		35,171
Downstream United States [Member]
Segment Reporting Information [Line Items]
Earnings after income tax	315		1,441		1,602		2,878
Sales and other operating revenue	32,032	[1]	31,621	[1]	92,995	[1]	92,991	[1]
Intersegment Revenue	5,056		5,422		15,312		16,214
Downstream Non-U.S. [Member]
Segment Reporting Information [Line Items]
Earnings after income tax	277		1,749		931		8,544	[3]
Sales and other operating revenue	57,179	[1]	60,763	[1]	164,066	[1]	190,590	[1]
Intersegment Revenue	14,099		15,309		39,263		47,215
Chemical United States [Member]
Segment Reporting Information [Line Items]
Earnings after income tax	680		565		1,947		1,492
Sales and other operating revenue	3,873	[1]	3,493	[1]	11,479	[1]	11,167	[1]
Intersegment Revenue	2,971		3,301		9,157		9,429
Chemical Non-U.S. [Member]
Segment Reporting Information [Line Items]
Earnings after income tax	345		225		971		1,448	[3]
Sales and other operating revenue	6,058	[1]	5,634	[1]	17,813	[1]	18,157	[1]
Intersegment Revenue	2,352		2,292		6,407		7,565
All Other [Member]
Segment Reporting Information [Line Items]
Earnings after income tax	(460)		(383)		(1,276)		(1,565)
Sales and other operating revenue	3	[1]	5	[1]	18	[1]	16	[1]
Intersegment Revenue	$ 66		$ 75		$ 204		$ 212

[1] Includes sales-based taxes

[2] Sales-based taxes included in sales and other operating revenue for the three months ended September 30, 2013, and 2012, were $7,882 million and $8,137 million, respectively, and for the nine months ended September 30, 2013, and 2012, were $22,926 million and $24,657 million, respectively.

[3] Nine months ended September 30, 2012, includes the 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.