Operating Segments and Geographic Data (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 220,156	[1]	$ 230,590	[1]	$ 244,371	[1]
Upstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	8,052		6,416		9,623
Upstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	17,607		19,459		20,086
Downstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	80,272		83,043		86,793
Downstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	105,373		113,279		119,254
All Other [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	358		378		526
All Other [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	3		4		4
Intersegment Eliminations [Member] | Upstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	16,865		17,229		18,115
Intersegment Eliminations [Member] | Upstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	33,034		34,094		35,012
Intersegment Eliminations [Member] | Downstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	39		49		86
Intersegment Eliminations [Member] | Downstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	859		80		81
Operating Segments [Member] | Upstream [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	75,558		77,198		82,836
Operating Segments [Member] | Upstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	24,917		23,645		27,738
Operating Segments [Member] | Upstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	50,641		53,553		55,098
Operating Segments [Member] | Downstream [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	195,034		204,462		214,299
Operating Segments [Member] | Downstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	85,103		87,757		91,078
Operating Segments [Member] | Downstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	109,931		116,705		123,221
Other Segment Reconciling Item: Excise and Similar Taxes [Member] | Downstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	4,792		4,665		4,199
Other Segment Reconciling Item: Excise and Similar Taxes [Member] | Downstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	3,699		3,346		3,886
Intersegment Eliminations, Corporate, Non-Segment [Member] | All Other [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	1,524		1,300		1,072
Intersegment Eliminations, Corporate, Non-Segment [Member] | All Other [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	31		48		42
Corporate, Non-Segment [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	1,916		1,730		1,644
Corporate, Non-Segment [Member] | All Other [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	1,882		1,678		1,598
Corporate, Non-Segment [Member] | All Other [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	34		52		46
Operating Segments and Coporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	272,508		283,390		298,779
Operating Segments and Coporate, Non-Segment [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	111,902		113,080		120,414
Operating Segments and Coporate, Non-Segment [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	160,606		170,310		178,365
Intersegment Eliminations, Operating Segments and Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ (52,352)		$ (52,800)		$ (54,408)

[1] *Includes excise, value-added and similar taxes.$8,492 $8,010 $8,085See accompanying Notes to the Consolidated Financial Statements.