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Segment Information
 3 Months Ended
Mar. 31, 2013
Segment Reporting [Abstract]  
SEGMENT INFORMATION
10.
SEGMENT INFORMATION

The following table reflects activity related to our reportable segments (in millions):
 
 
Refining
 
Retail
 
Ethanol
 
Corporate
 
Total
Three months ended March 31, 2013:
 
 
 
 
 
 
 
 
 
 
Operating revenues from external
customers
 
$
29,553

 
$
2,917

 
$
1,004

 
$
—

 
$
33,474

Intersegment revenues
 
2,205

 
—

 
55

 
—

 
2,260

Operating income (loss)
 
1,212

 
42

 
14

 
(207
)
 
1,061

 
 
 
 
 
 
 
 
 
 
 
Three months ended March 31, 2012:
 
 
 
 
 
 
 
 
 
 
Operating revenues from external
customers
 
31,150

 
2,935

 
1,082

 
—

 
35,167

Intersegment revenues
 
2,255

 
—

 
14

 
—

 
2,269

Operating income (loss)
 
(119
)
 
40

 
9

 
(174
)
 
(244
)


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

 
March 31,
2013
 
December 31,
2012
Refining
$
40,185

 
$
39,490

Retail
2,125

 
2,043

Ethanol
924

 
929

Corporate
2,267

 
2,015

Total assets
$
45,501

 
$
44,477