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Investment in Unconsolidated Affiliate (Tables) | 12 Months Ended
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Dec. 31, 2022
Equity Method Investments and Joint Ventures [Abstract] |
Summarized Balance Sheet Financial Information for Equity Method Investment | The following tables present summarized unaudited financial information for 100 percent of Enable as of December 2, 2021 and for the period of January 1, 2021 through December 2, 2021 and the year ended December 31, 2020.
Balance Sheet |  | December 2, 2021 |
(In millions) |  |  |
Current assets |  | $ | 594 |
Non-current assets |  | $ | 11,227 |
Current liabilities |  | $ | 1,254 |
Non-current liabilities |  | $ | 3,281 |
Summarized Income Statement Financial Information for Equity Method Investment |
|  | Period of |  |  |  |
Income Statement |  | January 1, 2021 through December 2, 2021 |  |  | Year Ended December 31, 2020 |
(In millions) |  |  |  |  |  |
Total revenues |  | $ | 3,466 |  |  | $ | 2,463 |
Cost of natural gas and NGLs (excluding depreciation and amortization) |  | $ | 1,959 |  |  | $ | 965 |
Operating income |  | $ | 634 |  |  | $ | 465 |
Net income |  | $ | 461 |  |  | $ | 52 |
Reconciliation of Equity in Earnings (Losses) of Unconsolidated Affiliates | The following table presents a reconciliation of OGE Energy's equity in earnings (losses) of unconsolidated affiliates for the period of January 1, 2021 through December 2, 2021 and the year ended December 31, 2020.
|  | Period of |  |  |  |
(In millions) |  | January 1, 2021 through December 2, 2021 |  |  | Year Ended December 31, 2020 |
Enable net income |  | $ | 461.0 |  |  | $ | 52.0 |
Differences due to timing of OGE Energy and Enable accounting close |  |  | 9.0 |  |  |  | — |
Enable net income used to calculate OGE Energy's equity in earnings |  | $ | 470.0 |  |  | $ | 52.0 |
OGE Energy's percent ownership at period end |  |  | 25.5 | % |  |  | 25.5 | %
OGE Energy's portion of Enable net income |  | $ | 119.8 |  |  | $ | 13.2 |
Amortization of basis difference and dilution recognition (A) |  |  | 50.0 |  |  |  | 98.8 |
Impairment of OGE Energy's equity method investment in Enable (B) |  |  | — |  |  |  | (780.0 | )
Equity in earnings (losses) of unconsolidated affiliates (C) |  | $ | 169.8 |  |  | $ | (668.0 | )
(A) Includes loss on dilution, net of proportional basis difference recognition. (B) During the year ended December 31, 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable as, effective March 31, 2020, OGE estimated the fair value of its investment in Enable was below the book value and concluded the decline in value was not temporary. (C) For the year ended December 31, 2020, Enable recorded a $225.0 million impairment on an equity method investment, which ran through OGE Energy's portion of Enable net income and was offset by basis differences that flow through the amortization of basis difference and dilution recognition line item above.
Schedule of Related Party Transactions [Table Text Block] | The following table presents summarized related party transactions between OG&E and Enable during the period of January 1, 2021 through December 2, 2021 and the year ended December 31, 2020.
|  | Period of |  |  |  |
(In millions) |  | January 1, 2021 through December 2, 2021 |  |  | Year Ended December 31, 2020 |
Operating revenues: |  |  |  |  |  |
Electricity to power electric compression assets |  | $ | 13.3 |  |  | $ | 15.1 |
Fuel, purchased power and direct transmission expense: |  |  |  |  |  |
Natural gas transportation services |  | $ | 32.7 |  |  | $ | 32.8 |
Natural gas purchases (sales) |  | $ | (33.5 | ) |  | $ | 2.7 |

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- Definition [Table Text Block] for Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Table] + References No definition available. + Details
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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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