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Segment Information
 9 Months Ended
Sep. 30, 2013
Segment Reporting [Abstract]  
SEGMENT INFORMATION
10.
SEGMENT INFORMATION

As discussed in Note 2, we completed the separation of our retail business on May 1, 2013. Segment activity related to our retail business prior to the separation is reflected in the retail segment results below. Motor fuel sales to CST (our former retail business), 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
 
Retail
 
Ethanol
 
Corporate
 
Total
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

 
 
 
 
 
 
 
 
 
 
 
Three months ended September 30, 2012:
 
 
 
 
 
 
 
 
 
 
Operating revenues from external
customers
 
30,543

 
3,092

 
1,091

 
—

 
34,726

Intersegment revenues
 
2,348

 
—

 
15

 
—

 
2,363

Operating income (loss)
 
1,528

 
41

 
(73
)
 
(187
)
 
1,309

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

 
3,896

 
3,885

 
—

 
103,645

Intersegment revenues
 
2,876

 
—

 
86

 
—

 
2,962

Operating income (loss)
 
2,733

 
81

 
222

 
(635
)
 
2,401

 
 
 
 
 
 
 
 
 
 
 
Nine months ended September 30, 2012:
 
 
 
 
 
 
 
 
 
 
Operating revenues from external
customers
 
92,181

 
9,089

 
3,285

 
—

 
104,555

Intersegment revenues
 
6,806

 
—

 
75

 
—

 
6,881

Operating income (loss)
 
2,773

 
253

 
(59
)
 
(541
)
 
2,426



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

 
September 30,
2013
 
December 31,
2012
Refining
$
43,035

 
$
39,490

Retail
—

 
2,043

Ethanol
879

 
929

Corporate
2,379

 
2,015

Total assets
$
46,293

 
$
44,477