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Segment Information
 9 Months Ended
Sep. 30, 2014
Segment Reporting [Abstract]  
SEGMENT INFORMATION
11.
SEGMENT INFORMATION

In May 2013, we completed the separation of our retail business, CST, and as a result, we no longer operate a retail business or report retail segment operating results. Segment activity related to our retail business prior to the separation is reflected in the retail segment results below. Motor fuel sales to CST, which were eliminated in consolidation prior to the separation, are reported as refining segment operating revenues from external customers after May 1, 2013.

The following table reflects activity related to our reportable segments (in millions):
 
Refining
 
Ethanol
 
Retail
 
Corporate
 
Total
Three months ended September 30, 2014:
 
 
 
 
 
 
 
 
 
Operating revenues from external
customers
$
33,274

 
$
1,134

 
$
—

 
$
—

 
$
34,408

Intersegment revenues
—

 
21

 
—

 
—

 
21

Operating income (loss)
1,664

 
198

 
—

 
(192
)
 
1,670

 
 
 
 
 
 
 
 
 
 
Three months ended September 30, 2013:
 
 
 
 
 
 
 
 
 
Operating revenues from external
customers
34,747

 
1,390

 
—

 
—

 
36,137

Intersegment revenues
—

 
16

 
—

 
—

 
16

Operating income (loss)
600

 
113

 
—

 
(181
)
 
532

 
 
 
 
 
 
 
 
 
 
Nine months ended September 30, 2014:
 
 
 
 
 
 
 
 
 
Operating revenues from external
customers
99,183

 
3,802

 
—

 
—

 
102,985

Intersegment revenues
—

 
55

 
—

 
—

 
55

Operating income (loss)
4,023

 
628

 
—

 
(545
)
 
4,106

 
 
 
 
 
 
 
 
 
 
Nine months ended September 30, 2013:
 
 
 
 
 
 
 
 
 
Operating revenues from external
customers
95,864

 
3,885

 
3,896

 
—

 
103,645

Intersegment revenues
2,876

 
86

 
—

 
—

 
2,962

Operating income (loss)
2,727

 
222

 
81

 
(635
)
 
2,395



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

 
September 30,
2014
 
December 31,
2013
Refining
$
42,378

 
$
41,227

Ethanol
916

 
889

Corporate
5,161

 
5,144

Total assets
$
48,455

 
$
47,260



In March 2014, we purchased an idled corn ethanol plant in Mount Vernon, Indiana for $34 million from a wholly owned subsidiary of Aventine Renewable Energy Holdings, Inc. We resumed production at that plant during the third quarter of 2014. We will finalize our purchase accounting once a determination of the fair values of the assets acquired and liabilities assumed is available, pending the completion of independent appraisals and other evaluations.