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Investment in Unconsolidated Affiliate
 12 Months Ended
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]  
Equity Method Investments and Joint Ventures Disclosure [Text Block] Investment in Unconsolidated Affiliates
On December 2, 2021, Energy Transfer completed its acquisition of Enable, and all of the 110,982,805 common units of Enable owned by OGE Energy were exchanged for 95,389,721 common units of Energy Transfer. As part of the transaction, Energy Transfer also acquired the general partner interests of Enable from OGE Energy and CenterPoint for cash consideration. Further discussion of the transaction can be found in Note 1. The below discussion relates to OGE Energy's equity method investment in Enable prior to December 2, 2021.

In 2013, OGE Energy, CenterPoint and another party formed Enable as a private limited partnership, and OGE Energy and the other party indirectly contributed 100 percent of the equity interests in Enogex LLC to Enable. OGE Energy determined that its contribution of Enogex LLC to Enable met the requirements of being in substance real estate and recorded the contribution at historical cost. The formation of Enable was considered a business combination, and CenterPoint was the acquirer of Enogex Holdings for accounting purposes. Under this method, the fair value of the consideration paid by
CenterPoint for Enogex Holdings was allocated to the assets acquired and liabilities assumed based on their fair value. Enogex Holdings' assets, liabilities and equity were accordingly adjusted to estimated fair value, resulting in an increase to Enable's equity of $2.2 billion. Since the contribution of Enogex LLC to Enable was recorded at historical cost, the effects of the amortization and depreciation expense associated with the fair value adjustments on Enable's results of operations were eliminated in OGE Energy's recording of its equity in earnings of Enable through the closing date of December 2, 2021. As prior real estate sales accounting guidance was superseded by ASU 2017-05, "Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets," prior to December 2, 2021, OGE Energy recognized gains or losses on sales or dilution events in its investment in Enable within OGE Energy's earnings, net of proportional basis difference recognition.

OGE Energy recorded equity in earnings of unconsolidated affiliates of $169.8 million for the period of January 1, 2021 through December 2, 2021 compared to equity in losses of unconsolidated affiliates of $668.0 million for the year ended December 31, 2020 and equity in earnings of unconsolidated affiliates of $113.9 million for the year ended December 31, 2019. Equity in earnings (losses) of unconsolidated affiliates includes OGE Energy's share of Enable's earnings adjusted for the amortization of the basis difference of OGE Energy's original investment in Enogex LLC and its previous underlying equity in the net assets of Enable, as well as any impairment OGE Energy recorded on its investment in Enable. Equity in earnings (losses) of unconsolidated affiliates was also adjusted for the elimination of the Enogex Holdings fair value adjustments, as described above. These amortizations may also include gain or loss on dilution, net of proportional basis difference recognition.

The following tables present summarized unaudited financial information for 100 percent of Enable as of December 2, 2021 and December 31, 2020 and for the period of January 1, 2021 through December 2, 2021 and the years ended December 31, 2020 and 2019.
Balance SheetDecember 2, 2021December 31, 2020
(In millions)
Current assets$594 $381 
Non-current assets$11,227 $11,348 
Current liabilities$1,254 $582 
Non-current liabilities$3,281 $4,052 
Period of January 1, 2021 through December 2, 2021Year Ended
Income StatementDecember 31, 2020December 31, 2019
(In millions)
Total revenues$3,466 $2,463 $2,960 
Cost of natural gas and NGLs (excluding depreciation and amortization)$1,959 $965 $1,279 
Operating income$634 $465 $569 
Net income$461 $52 $360 
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 years ended December 31, 2020 and 2019. For further discussion of Enable's net income, see "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations - Results of Operations - OGE Holdings (Natural Gas Midstream Operations)."
Period of January 1, 2021 through December 2, 2021Year Ended
(In millions)December 31, 2020December 31, 2019
Enable net income$461.0 $52.0 $360.0 
Differences due to timing of OGE Energy and Enable accounting close9.0 — — 
Enable net income used to calculate OGE Energy's equity in earnings$470.0 $52.0 $360.0 
OGE Energy's percent ownership at period end25.5 %25.5 %25.5 %
OGE Energy's portion of Enable net income$119.8 $13.2 $91.8 
Amortization of basis difference and dilution recognition (A)50.0 98.8 22.1 
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)$113.9 
(A)Includes loss on dilution, net of proportional basis difference recognition.
(B)Effective March 31, 2020, OGE Energy estimated the fair value of its investment in Enable was below the book value and concluded the decline in value was not temporary due to the severity of the decline and recent rapid deterioration, as well as the near term future outlook, of the midstream oil and gas industry. Accordingly, OGE Energy recorded a $780.0 million impairment on its investment in Enable in 2020. Further information concerning the fair value method used to measure the impairment on OGE Energy's investment in Enable can be found in Note 7.
(C)For the year ended December 31, 2020, Enable recorded a $225.0 million impairment on its SESH equity method investment. Enable estimated the fair value of this equity method investment was below the carrying value at September 30, 2020 and concluded the decline in value was other than temporary due to the expiration of a transportation contract and the current status of renewal negotiations. The impairment 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.

Distributions received from Enable were $73.4 million, $91.7 million and $144.0 million during the years ended December 31, 2021, 2020 and 2019, respectively.
OGE Energy accounted for its investment in Enable as an equity method investment until the merger with Energy Transfer closed on December 2, 2021. As a result of the transaction, OGE Energy recorded a pre-tax gain of $344.4 million, which contemplates the December 2, 2021 fair value of the Energy Transfer securities, the December 2, 2021 balance of OGE Energy's equity method investment in Enable, the $35.0 million cash payment received as part of the transaction ($5.0 million from Energy Transfer and $30.0 million from CenterPoint), the accumulated other comprehensive loss impact of OGE Energy's share of Enable's interest rate derivative losses and OGE Energy's transaction costs of $8.6 million.