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Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment information for our reportable segments
Operating revenues	$ 36,137	$ 34,726	$ 103,645	$ 104,555
Operating income (loss)	532	1,309	2,401	2,426
Total assets by reportable segment
Reportable segment assets	46,293		46,293		44,477
Refining [Member]
Total assets by reportable segment
Reportable segment assets	43,035		43,035		39,490
Retail [Member]
Total assets by reportable segment
Reportable segment assets	0		0		2,043
Ethanol [Member]
Total assets by reportable segment
Reportable segment assets	879		879		929
Corporate and Other [Member]
Total assets by reportable segment
Reportable segment assets	2,379		2,379		2,015
Operating Segments [Member] | Refining [Member]
Segment information for our reportable segments
Operating revenues	34,747	30,543	95,864	92,181
Operating income (loss)	600	1,528	2,733	2,773
Operating Segments [Member] | Retail [Member]
Segment information for our reportable segments
Operating revenues	0	3,092	3,896	9,089
Operating income (loss)	0	41	81	253
Operating Segments [Member] | Ethanol [Member]
Segment information for our reportable segments
Operating revenues	1,390	1,091	3,885	3,285
Operating income (loss)	113	(73)	222	(59)
Corporate, Non-Segment [Member] | Corporate and Other [Member]
Segment information for our reportable segments
Operating revenues	0	0	0	0
Operating income (loss)	(181)	(187)	(635)	(541)
Intersegment Eliminations [Member]
Segment information for our reportable segments
Operating revenues	16	2,363	2,962	6,881
Intersegment Eliminations [Member] | Refining [Member]
Segment information for our reportable segments
Operating revenues	0	2,348	2,876	6,806
Intersegment Eliminations [Member] | Retail [Member]
Segment information for our reportable segments
Operating revenues	0	0	0	0
Intersegment Eliminations [Member] | Ethanol [Member]
Segment information for our reportable segments
Operating revenues	$ 16	$ 15	$ 86	$ 75

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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Revenue related to the downstream oil and gas activities, including the refining of crude oil, as well as the marketing and distribution of crude oil, refined petroleum products, and natural gas.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

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