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Segment Disclosures and Related Information (Summary of Geographic Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Analysis of results of sales and other operating revenues and long-lived assets by geographical location [Abstract]
Sales and other operating revenues	$ 23,397	$ 21,624	$ 21,849	$ 17,409	$ 21,893	$ 25,792	$ 28,512	$ 22,778	$ 84,279	[1]	$ 98,975	[1]	$ 161,212	[1]
Long-Lived Assets	34,209				31,701				34,209		31,701		27,384
United States
Analysis of results of sales and other operating revenues and long-lived assets by geographical location [Abstract]
Sales and other operating revenues									59,742		69,578		110,713
Long-Lived Assets	32,442				29,624				32,442		29,624		25,255
United Kingdom
Analysis of results of sales and other operating revenues and long-lived assets by geographical location [Abstract]
Sales and other operating revenues									9,895		12,120		20,131
Long-Lived Assets	1,177				1,459				1,177		1,459		1,469
Germany
Analysis of results of sales and other operating revenues and long-lived assets by geographical location [Abstract]
Sales and other operating revenues									6,128		6,584		9,424
Long-Lived Assets	503				502				503		502		534
Other foreign countries
Analysis of results of sales and other operating revenues and long-lived assets by geographical location [Abstract]
Sales and other operating revenues									8,514		10,693		20,944
Long-Lived Assets	$ 87				$ 116				$ 87		$ 116		$ 126
[1] Includes excise taxes on petroleum products sales: $13,381 million, $13,780 million, $14,698 million

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- Definition

Analysis of results of sales and other operating revenues and long-lived assets by geographical location [Abstract]

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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