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Revenue from Contracts with Customers (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, |  | Six Months Ended June 30,
(In millions) | 2021 | 2020 |  | 2021 | 2020
Residential | $ | 178.5 |  | $ | 202.8 |  |  | $ | 746.7 |  | $ | 369.7 |
Commercial | 108.3 |  | 113.0 |  |  | 415.8 |  | 204.3 |
Industrial | 37.5 |  | 44.7 |  |  | 184.2 |  | 86.2 |
Oilfield | 28.7 |  | 38.4 |  |  | 189.5 |  | 76.6 |
Public authorities and street light | 37.0 |  | 40.6 |  |  | 160.1 |  | 75.3 |
System sales revenues | 390.0 |  | 439.5 |  |  | 1,696.3 |  | 812.1 |
Provision for rate refund | — |  | (1.0) |  |  | — |  | (1.6) |
Integrated market | 128.3 |  | 8.5 |  |  | 430.4 |  | 15.7 |
Transmission | 36.7 |  | 39.8 |  |  | 73.0 |  | 74.0 |
Other | 9.5 |  | 5.2 |  |  | (14.2) |  | 12.2 |
Revenues from contracts with customers (A) | $ | 564.5 |  | $ | 492.0 |  |  | $ | 2,185.5 |  | $ | 912.4 |
(A) In February 2021, Winter Storm Uri resulted in record winter peak demand for electricity and extremely high natural gas and purchased power prices in OG&E's service territory. Operating revenues significantly increased due to increased fuel, purchased power and direct transmission expenses, which are recoverable from customers, as a result of Winter Storm Uri. 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=123351226&loc=SL49130545-203045 + Details
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