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Revenue from Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
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 7. Management's Discussion and Analysis of Financial Condition and Results of Operations."
| Year Ended December 31,
(In millions) | 2020 | 2019 | 2018
Residential | $ | 842.7 |  | $ | 865.8 |  | $ | 877.8 |
Commercial | 465.6 |  | 486.6 |  | 500.0 |
Industrial | 192.6 |  | 217.8 |  | 228.9 |
Oilfield | 169.2 |  | 200.4 |  | 190.4 |
Public authorities and street light | 172.3 |  | 190.3 |  | 197.4 |
System sales revenues | 1,842.4 |  | 1,960.9 |  | 1,994.5 |
Provision for rate refund | 3.8 |  | (0.9) |  | (6.0) |
Integrated market | 49.6 |  | 38.4 |  | 48.7 |
Transmission | 143.3 |  | 148.0 |  | 147.4 |
Other | 30.7 |  | 29.1 |  | 27.1 |
Revenues from contracts with customers | $ | 2,069.8 |  | $ | 2,175.5 |  | $ | 2,211.7 |

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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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