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Report of Business Segments | 3 Months Ended
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Mar. 31, 2021
Segment Reporting [Abstract] |
Report of Business Segments | Report of Business SegmentsOGE Energy 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) the natural gas midstream operations segment. 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. The following tables present the results of OGE Energy's business segments for the three months ended March 31, 2021 and 2020.
Three Months Ended March 31, 2021 | Electric Utility | Natural Gas Midstream Operations | Other Operations | Eliminations | Total
(In millions) |  |  |  |  |
Operating revenues | $ | 1,630.6 |  | $ | — |  | $ | — |  | $ | — |  | $ | 1,630.6 |
Cost of sales | 1,346.8 |  | — |  | — |  | — |  | 1,346.8 |
Other operation and maintenance | 110.3 |  | 0.4 |  | (1.4) |  | — |  | 109.3 |
Depreciation and amortization | 98.7 |  | — |  | — |  | — |  | 98.7 |
Taxes other than income | 25.7 |  | 0.1 |  | 1.4 |  | — |  | 27.2 |
Operating income (loss) | 49.1 |  | (0.5) |  | — |  | — |  | 48.6 |
Equity in earnings of unconsolidated affiliates | — |  | 53.2 |  | — |  | — |  | 53.2 |
Other income (expense) | 1.7 |  | (0.5) |  | (0.1) |  | (0.2) |  | 0.9 |
Interest expense | 38.4 |  | — |  | 1.2 |  | (0.2) |  | 39.4 |
Income tax expense (benefit) | 1.2 |  | 14.3 |  | (4.9) |  | — |  | 10.6 |
Net income | $ | 11.2 |  | $ | 37.9 |  | $ | 3.6 |  | $ | — |  | $ | 52.7 |
Investment in unconsolidated affiliates | $ | — |  | $ | 409.2 |  | $ | 23.6 |  | $ | — |  | $ | 432.8 |
Total assets | $ | 11,248.2 |  | $ | 415.4 |  | $ | 521.6 |  | $ | (396.5) |  | $ | 11,788.7 |
Three Months Ended March 31, 2020 | Electric Utility | Natural Gas Midstream Operations | Other Operations | Eliminations | Total
(In millions) |  |  |  |  |
Operating revenues | $ | 431.3 |  | $ | — |  | $ | — |  | $ | — |  | $ | 431.3 |
Cost of sales | 135.0 |  | — |  | — |  | — |  | 135.0 |
Other operation and maintenance | 121.0 |  | 0.6 |  | (1.6) |  | — |  | 120.0 |
Depreciation and amortization | 94.4 |  | — |  | — |  | — |  | 94.4 |
Taxes other than income | 23.9 |  | 0.1 |  | 1.6 |  | — |  | 25.6 |
Operating income (loss) | 57.0 |  | (0.7) |  | — |  | — |  | 56.3 |
Equity in losses of unconsolidated affiliates (A) | — |  | (746.5) |  | — |  | — |  | (746.5) |
Other income | 1.8 |  | — |  | 1.3 |  | (1.0) |  | 2.1 |
Interest expense | 36.9 |  | — |  | 2.4 |  | (1.0) |  | 38.3 |
Income tax expense (benefit) | 2.0 |  | (179.2) |  | (57.4) |  | — |  | (234.6) |
Net income (loss) | $ | 19.9 |  | $ | (568.0) |  | $ | 56.3 |  | $ | — |  | $ | (491.8) |
Investment in unconsolidated affiliates | $ | — |  | $ | 348.0 |  | $ | 19.5 |  | $ | — |  | $ | 367.5 |
Total assets | $ | 10,030.7 |  | $ | 353.4 |  | $ | 252.9 |  | $ | (266.1) |  | $ | 10,370.9 |
(A) In 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Note 4.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8981-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8657-108599 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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