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Report of Business Segments | 12 Months Ended
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Dec. 31, 2013
Segment Reporting [Abstract] |
Report of Business Segments | Report of Business Segments Prior to May 1, 2013, the Company's business was divided into three segments as follows: (i) electric utility, which is engaged in the generation, transmission, distribution and sale of electric energy, (ii) natural gas transportation and storage and (iii) natural gas gathering and processing. On March 14, 2013, OGE Energy entered into a Master Formation Agreement with the ArcLight group and CenterPoint Energy, Inc., pursuant to which OGE Energy, the ArcLight Group and CenterPoint Energy, Inc., agreed to form Enable Midstream Partners to own and operate the midstream businesses of OGE Energy and CenterPoint that will initially be structured as a private limited partnership. The transaction closed on May 1, 2013. As a result, effective May 1, 2013, OGE Energy deconsolidated its interest in Enogex Holdings LLC and began accounting for its interest in Enable using the equity method of accounting. The Company's business is now divided into two segments for financial reporting purposes as follows: (i) electric utility and (ii) natural gas midstream operations. The former natural gas transportation and storage segment and natural gas gathering and processing segment have been combined into the natural gas midstream operations segment and have been restated for all prior periods presented. Equity in earnings of unconsolidated affiliates in the natural gas midstream operations segment includes OGE Energy's equity interest in Enable from May 1, 2013 through December 31, 2013. Operating income for the natural gas midstream operations segment represents results of operations for Enogex Holdings LLC through April 30, 2013. Investment in unconsolidated affiliates in the natural gas midstream operations segment represents OGE Energy's investment in Enable at December 31, 2013. 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 its measure of segment profit and loss, and, therefore, has presented this information below. The following tables summarize the results of the Company's business segments for the years ended December 31, 2013, 2012 and 2011.
2013 | Electric Utility | Natural Gas Midstream Operations | Other Operations | Eliminations | Total
(In millions) |  |  |  |  |
Operating revenues | $ | 2,262.2 |  | $ | 630.4 |  | $ | — |  | $ | (24.9 | ) | $ | 2,867.7 |
Cost of sales | 965.9 |  | 489.0 |  | — |  | (26.0 | ) | 1,428.9 |
Other operation and maintenance | 438.8 |  | 60.9 |  | (10.5 | ) | — |  | 489.2 |
Depreciation and amortization | 248.4 |  | 36.8 |  | 12.1 |  | — |  | 297.3 |
Taxes other than income | 83.8 |  | 10.5 |  | 4.5 |  | — |  | 98.8 |
Operating income (loss) | $ | 525.3 |  | $ | 33.2 |  | $ | (6.1 | ) | $ | 1.1 |  | $ | 553.5 |
Equity in earnings of unconsolidated affiliates | $ | — |  | $ | 101.9 |  | $ | — |  | $ | — |  | $ | 101.9 |
Investment in unconsolidated affiliates (at historical cost) | $ | — |  | $ | 1,298.8 |  | $ | — |  | $ | — |  | $ | 1,298.8 |
Total assets | $ | 7,694.9 |  | $ | 1,348.6 |  | $ | 216.2 |  | $ | (125.0 | ) | $ | 9,134.7 |
Capital expenditures | $ | 797.6 |  | $ | 181.5 |  | $ | 11.5 |  | $ | — |  | $ | 990.6 |
2012 | Electric Utility | Natural Gas Midstream Operations | Other Operations | Eliminations | Total
(In millions) |  |  |  |  |
Operating revenues | $ | 2,141.2 |  | $ | 1,608.6 |  | $ | — |  | $ | (78.6 | ) | $ | 3,671.2 |
Cost of sales | 879.1 |  | 1,120.1 |  | — |  | (80.5 | ) | 1,918.7 |
Other operation and maintenance | 446.3 |  | 172.9 |  | (17.7 | ) | — |  | 601.5 |
Depreciation and amortization | 248.7 |  | 108.8 |  | 13.5 |  | — |  | 371.0 |
Impairment of assets | — |  | 0.4 |  | — |  | — |  | 0.4 |
Gain on insurance proceeds | — |  | (7.5 | ) | — |  | — |  | (7.5 | )
Taxes other than income | 77.7 |  | 28.3 |  | 4.2 |  | — |  | 110.2 |
Operating income (loss) | $ | 489.4 |  | $ | 185.6 |  | $ | — |  | $ | 1.9 |  | $ | 676.9 |
Total assets | $ | 7,222.4 |  | $ | 2,681.3 |  | $ | 242.6 |  | $ | (224.1 | ) | $ | 9,922.2 |
Capital expenditures | $ | 704.4 |  | $ | 506.5 |  | $ | 18.3 |  | $ | — |  | $ | 1,229.2 |
2011 | Electric Utility | Natural Gas Midstream Operations | Other Operations | Eliminations | Total
(In millions) |  |  |  |  |
Operating revenues | $ | 2,211.5 |  | $ | 1,787.1 |  | $ | — |  | $ | (82.7 | ) | $ | 3,915.9 |
Cost of sales | 1,013.5 |  | 1,346.6 |  | — |  | (82.2 | ) | 2,277.9 |
Other operation and maintenance | 436.0 |  | 162.5 |  | (17.3 | ) | — |  | 581.2 |
Depreciation and amortization | 216.1 |  | 77.6 |  | 13.4 |  | — |  | 307.1 |
Impairment of assets | — |  | 6.3 |  | — |  | — |  | 6.3 |
Gain on insurance proceeds | — |  | (3.0 | ) | — |  | — |  | (3.0 | )
Taxes other than income | 73.6 |  | 22.0 |  | 4.1 |  | — |  | 99.7 |
Operating income (loss) | $ | 472.3 |  | $ | 175.1 |  | $ | (0.2 | ) | $ | (0.5 | ) | $ | 646.7 |
Total assets | $ | 6,620.9 |  | $ | 2,289.0 |  | $ | 155.0 |  | $ | (158.9 | ) | $ | 8,906.0 |
Capital expenditures | $ | 844.5 |  | $ | 612.5 |  | $ | 13.8 |  | $ | — |  | $ | 1,470.8 |

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599 + Details
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