Segment Information (Tables)

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Segment information for our reportable segments

The following table reflects activity related to our reportable segments (in millions):

	Refining		Retail		Ethanol		Corporate			Total
Three months ended June 30, 2013:
Operating revenues from external customers	$	31,564	$	979	$	1,491	$	—		$	34,034
Intersegment revenues	671		—		15		—			686
Operating income (loss)	921		39		95		(247		)	808
Three months ended June 30, 2012:
Operating revenues from external customers	30,488		3,062		1,112		—			34,662
Intersegment revenues	2,203		—		46		—			2,249
Operating income (loss)	1,364		172		5		(180		)	1,361
Six months ended June 30, 2013:
Operating revenues from external customers	61,117		3,896		2,495		—			67,508
Intersegment revenues	2,876		—		70		—			2,946
Operating income (loss)	2,133		81		109		(454		)	1,869
Six months ended June 30, 2012:
Operating revenues from external customers	61,638		5,997		2,194		—			69,829
Intersegment revenues	4,458		—		60		—			4,518
Operating income (loss)	1,245		212		14		(354		)	1,117

Total assets by reportable segment were as follows (in millions):

	June 30, 2013		December 31, 2012
Refining	$	40,527	$	39,490
Retail	—		2,043
Ethanol	867		929
Corporate	2,783		2,015
Total assets	$	44,177	$	44,477