Disclosures About Segments And Related Information (Schedule Of Segments And Related Information) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Earnings after income tax	$ 32,520		$ 32,580		$ 44,880
Earnings of equity companies included above	13,323		13,927		15,010
Sales and other operating revenue	394,105	[1],[2]	420,836	[1],[2]	451,509	[1],[2]
Depreciation and depletion expense	17,297		17,182		15,888
Interest revenue	75		87		117
Interest expense	286		9		327
Income taxes	18,015		24,263		31,045
Additions to property, plant and equipment	34,256		37,741		35,179
Investments in equity companies	20,017		19,619		18,530
Total assets	349,493		346,808		333,795
U.S. [Member]
Income taxes	1,862		1,391		3,579
Non-U.S. [Member]
Income taxes	16,153		22,872		27,466
Upstream [Member] | U.S. [Member]
Earnings after income tax	5,197		4,191		3,925
Earnings of equity companies included above	1,235		1,576		1,759
Sales and other operating revenue	14,826	[2]	13,712	[2]	11,039	[2]
Intersegment revenue	7,723		8,343		8,764
Depreciation and depletion expense	5,139		5,170		5,104
Interest expense	40		30		37
Income taxes	1,300		2,197		2,025
Additions to property, plant and equipment	9,098		7,480		9,697
Investments in equity companies	5,089		4,975		4,020
Total assets	92,555		88,698		86,146
Upstream [Member] | Non-U.S. [Member]
Earnings after income tax	22,351		22,650		25,970
Earnings of equity companies included above	10,859		11,627		11,900
Sales and other operating revenue	22,336	[2]	25,349	[2]	27,673	[2]
Intersegment revenue	38,846		45,761		47,507
Depreciation and depletion expense	8,523		8,277		7,340
Interest expense	17		26		13
Income taxes	15,165		21,554		25,362
Additions to property, plant and equipment	19,225		26,075		21,769
Investments in equity companies	10,877		9,740		9,147
Total assets	161,033		157,465		140,848
Downstream [Member] | U.S. [Member]
Earnings after income tax	1,618		2,199		3,575
Earnings of equity companies included above	29		(460)		6
Sales and other operating revenue	118,771	[2]	123,802	[2]	125,088	[2]
Intersegment revenue	17,281		20,781		20,963
Depreciation and depletion expense	654		633		594
Interest expense	6		7		3
Income taxes	610		721		1,811
Additions to property, plant and equipment	1,050		616		480
Investments in equity companies	69		62		195
Total assets	18,371		19,261		18,451
Downstream [Member] | Non-U.S. [Member]
Earnings after income tax	1,427		1,250		9,615
Earnings of equity companies included above	82		22		387
Sales and other operating revenue	199,976	[2]	218,904	[2]	248,959	[2]
Intersegment revenue	44,231		52,624		62,130
Depreciation and depletion expense	1,228		1,390		1,280
Interest expense	4		8		36
Income taxes	968		481		1,892
Additions to property, plant and equipment	1,356		1,072		1,153
Investments in equity companies	1,006		1,749		2,069
Total assets	33,299		40,661		40,956
Chemical [Member] | U.S. [Member]
Earnings after income tax	2,804		2,755		2,220
Earnings of equity companies included above	186		189		183
Sales and other operating revenue	15,115	[2]	15,295	[2]	14,723	[2]
Intersegment revenue	10,117		11,993		12,409
Depreciation and depletion expense	370		378		376
Interest expense			1
Income taxes	1,032		989		755
Additions to property, plant and equipment	1,564		840		338
Investments in equity companies	258		217		233
Total assets	8,798		7,816		7,238
Chemical [Member] | Non-U.S. [Member]
Earnings after income tax	1,511		1,073		1,678
Earnings of equity companies included above	1,377		1,422		1,267
Sales and other operating revenue	23,063	[2]	23,753	[2]	24,003	[2]
Intersegment revenue	8,098		8,232		9,750
Depreciation and depletion expense	645		632		508
Interest expense					(1)
Income taxes	358		363		232
Additions to property, plant and equipment	564		272		659
Investments in equity companies	3,026		3,103		3,143
Total assets	18,449		19,659		18,886
Corporate And Financing [Member]
Earnings after income tax	(2,388)		(1,538)		(2,103)
Earnings of equity companies included above	(445)		(449)		(492)
Sales and other operating revenue	18	[2]	21	[2]	24	[2]
Intersegment revenue	274		285		258
Depreciation and depletion expense	738		702		686
Interest revenue	75		87		117
Interest expense	219		(63)		239
Income taxes	(1,418)		(2,042)		(1,032)
Additions to property, plant and equipment	1,399		1,386		1,083
Investments in equity companies	(308)		(227)		(277)
Total assets	$ 16,988		$ 13,248		$ 21,270

[1] Sales and other operating revenue includes sales-based taxes of $29,342 million for 2014, $30,589 million for 2013 and $32,409 million for 2012.

[2] Sales and other operating revenue includes sales-based taxes of $29,342 million for 2014, $30,589 million for 2013 and $32,409 million for 2012. See Note 1, Summary of Accounting Policies.