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Revenue from Contracts with Customers (Tables) | 3 Months Ended
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Mar. 31, 2021
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue [Table Text Block] | The following table presents OG&E's revenues from contracts with customers disaggregated by customer classification. OG&E's operating revenues disaggregated by customer classification can be found in "OG&E (Electric Utility) Results of Operations" within "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations."
|  |  | Three Months Ended March 31,
(In millions) |  |  |  | 2021 | 2020
Residential |  |  |  | $ | 568.2 |  | $ | 166.9 |
Commercial |  |  |  | 307.5 |  | 91.3 |
Industrial |  |  |  | 146.7 |  | 41.5 |
Oilfield |  |  |  | 160.8 |  | 38.2 |
Public authorities and street light |  |  |  | 123.1 |  | 34.7 |
System sales revenues |  |  |  | 1,306.3 |  | 372.6 |
Provision for rate refund |  |  |  | — |  | (0.6) |
Integrated market |  |  |  | 302.1 |  | 7.2 |
Transmission |  |  |  | 36.3 |  | 34.2 |
Other |  |  |  | (23.7) |  | 7.0 |
Revenues from contracts with customers (A) |  |  |  | $ | 1,621.0 |  | $ | 420.4 |
(A) In February 2021, OG&E's service territory experienced an unprecedented, prolonged, cold spell that resulted in record winter peak demand for electricity and extremely high natural gas and purchased power prices. Operating revenues significantly increased due to increased cost of sales, which are recovered from customers, as a result of the February 2021 extreme cold weather event. For further discussion, see Note 15 and "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operation."

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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