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Report of Business Segments
 3 Months Ended
Mar. 31, 2014
Segment Reporting [Abstract]  
Report of Business Segments
Report of Business Segments

The Company reports its operations in two business segments: (i) the electric utility segment, which is engaged in the generation, transmission, distribution and sale of electric energy, and (ii) natural gas midstream operations segment.

The natural gas midstream operations segment reflects the Company's equity interest in Enable since its formation on May 1, 2013. Prior to May 1, 2013, the Company reported the results of Enogex Holdings in two separate segments: the natural gas transportation and storage segment, and the natural gas gathering and processing segment. After the deconsolidation, these segments were combined into the natural gas midstream operations segment. The presentation of results for the three months ended March 31, 2013 have been revised to reflect this change. Equity in earnings of unconsolidated affiliates in the natural gas midstream operations segment includes OGE Energy's equity interest in Enable since May 1, 2013. Other than equity in earnings of unconsolidated affiliates, all amounts for the natural gas midstream operations segment represent the operation results of Enogex Holdings through April 30, 2013. Investment in unconsolidated affiliates in the natural gas midstream operations segment represents OGE Energy's investment in Enable at March 31, 2014.

Other Operations primarily includes the operations of the holding company. 

Intersegment revenues are recorded at prices comparable to those of unaffiliated customers and are affected by regulatory considerations.

In reviewing its segment operating results, the Company focuses on operating income and equity in earnings of unconsolidated affiliates as measures of segment profit and loss, and, therefore, has presented this information below.  The following tables summarize the results of the Company's business segments during the three months ended March 31, 2014 and 2013.
Three Months Ended
March 31, 2014
 Electric Utility
Natural Gas Midstream Operations
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
Operating revenues
$
560.4

$
—

$
—

$
—

$
560.4

Cost of sales
293.4

—

—

—

293.4

Other operation and maintenance
117.1

—

(4.7
)
—

112.4

Depreciation and amortization
64.3

—

2.9

—

67.2

Taxes other than income
23.8

—

1.8

—

25.6

Operating income (loss)
$
61.8

$
—

$
—

$
—

$
61.8

Equity in earnings of unconsolidated affiliates
$
—

$
47.9

$
—

$
—

$
47.9

 
 
 
 
 
 
Investment in unconsolidated affiliates (at historical cost)
$
—

$
1,314.2

$
—

$
—

$
1,314.2

Total assets
$
7,826.8

$
1,367.4

$
127.9

$
(71.4
)
$
9,250.7

Three Months Ended
March 31, 2013
 Electric Utility
Natural Gas Midstream Operations
Other Operations
Eliminations
Total
(In millions)
 
 
 
 
 
Operating revenues
$
455.5

$
464.3

$
—

$
(18.4
)
$
901.4

Cost of sales
213.0

359.2

—

(19.2
)
553.0

Other operation and maintenance
105.1

45.2

(2.3
)
—

148.0

Depreciation and amortization
61.3

27.6

3.0

—

91.9

Taxes other than income
23.2

8.0

1.9

—

33.1

Operating income (loss)
$
52.9

$
24.3

$
(2.6
)
$
0.8

$
75.4

 
 
 
 
 
 
Total assets
$
7,138.4

$
2,729.9

$
381.6

$
(268.1
)
$
9,981.8