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Segment Disclosures and Related Information (Summary of Sales and Other Operating Revenues and Depreciation, Amortization, and Impairments) (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 by operating segment
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]
Analysis of results of depreciation, amortization and impairments by operating segment
Depreciation, Amortization and Impairments									1,173		1,085		1,145
Midstream
Analysis of results of sales and other operating revenues by operating segment
Sales and other operating revenues									2,927		2,642		5,118
Analysis of results of depreciation, amortization and impairments by operating segment
Depreciation, Amortization and Impairments									218		128		92
Chemicals
Analysis of results of sales and other operating revenues by operating segment
Sales and other operating revenues									5		5		7
Analysis of results of depreciation, amortization and impairments by operating segment
Depreciation, Amortization and Impairments									0		0		0
Refining
Analysis of results of sales and other operating revenues by operating segment
Sales and other operating revenues									17,948		23,153		47,063
Analysis of results of depreciation, amortization and impairments by operating segment
Depreciation, Amortization and Impairments									770		741		850
Marketing and Specialties
Analysis of results of sales and other operating revenues by operating segment
Sales and other operating revenues									63,367		73,145		108,992
Analysis of results of depreciation, amortization and impairments by operating segment
Depreciation, Amortization and Impairments									107		100		97
Corporate and Other
Analysis of results of sales and other operating revenues by operating segment
Sales and other operating revenues									32		30		32
Analysis of results of depreciation, amortization and impairments by operating segment
Depreciation, Amortization and Impairments									78		116		106
Operating Segments | Midstream
Analysis of results of sales and other operating revenues by operating segment
Sales and other operating revenues									4,226		3,676		6,222
Operating Segments | Refining
Analysis of results of sales and other operating revenues by operating segment
Sales and other operating revenues									52,068		63,470		115,326
Operating Segments | Marketing and Specialties
Analysis of results of sales and other operating revenues by operating segment
Sales and other operating revenues									64,476		74,591		110,540
Intersegment Eliminations | Midstream
Analysis of results of sales and other operating revenues by operating segment
Sales and other operating revenues									(1,299)		(1,034)		(1,104)
Intersegment Eliminations | Refining
Analysis of results of sales and other operating revenues by operating segment
Sales and other operating revenues									(34,120)		(40,317)		(68,263)
Intersegment Eliminations | Marketing and Specialties
Analysis of results of sales and other operating revenues by operating segment
Sales and other operating revenues									$ (1,109)		$ (1,446)		$ (1,548)
[1] Includes excise taxes on petroleum products sales: $13,381 million, $13,780 million, $14,698 million

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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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