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Segment Disclosures and Related Information (Summary of Sales and Other Operating Revenues by Product Line) (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 product line by operating segment [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]
Refined products
Analysis of results of sales and other operating revenues by product line by operating segment [Abstract]
Sales and other operating revenues									73,385		86,249		133,625
Crude oil resales
Analysis of results of sales and other operating revenues by product line by operating segment [Abstract]
Sales and other operating revenues									7,594		8,993		19,832
NGL
Analysis of results of sales and other operating revenues by product line by operating segment [Abstract]
Sales and other operating revenues									3,107		2,998		6,447
Other
Analysis of results of sales and other operating revenues by product line by operating segment [Abstract]
Sales and other operating revenues									$ 193		$ 735		$ 1,308
[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 by product line by operating segment [Abstract]

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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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