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Revenue from Contracts with Customers (Tables) | 9 Months Ended
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Sep. 30, 2018
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue [Table Text Block] | The following table disaggregates the Company's revenues from contracts with customers by customer classification. The Company's operating revenues disaggregated by customer classification can be found in "OG&E (Electric Utility) Results of Operations" in "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations."
| September 30, 2018
(In millions) | Three Months Ended | Nine Months Ended
Residential | $ | 281.0 |  | $ | 694.6 |
Commercial | 174.7 |  | 444.9 |
Industrial | 56.2 |  | 145.5 |
Oilfield | 39.5 |  | 110.9 |
Public authorities and street light | 58.7 |  | 151.5 |
System sales revenues | 610.1 |  | 1,547.4 |
Provision for rate refund | 13.5 |  | (6.2 | )
Integrated market | 16.9 |  | 38.7 |
Transmission | 33.2 |  | 109.2 |
Other | 10.8 |  | 21.0 |
Revenues from contracts with customers | $ | 684.5 |  | $ | 1,710.1 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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