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Investment in Unconsolidated Affiliate (Tables)
 12 Months Ended
Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]  
Summarized Balance Sheet Financial Information, Equity Method Investment [Table Text Block]
The following tables present summarized unaudited financial information for 100 percent of Enable as of December 31, 2020 and 2019 and for the years ended December 31, 2020, 2019 and 2018.
December 31,
Balance Sheet20202019
(In millions)
Current assets$381 $389 
Non-current assets$11,348 $11,877 
Current liabilities$582 $780 
Non-current liabilities$4,052 $4,077 
Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block]
Year Ended December 31,
Income Statement202020192018
(In millions)
Total revenues$2,463 $2,960 $3,431 
Cost of natural gas and NGLs$965 $1,279 $1,819 
Operating income$465 $569 $648 
Net income$52 $360 $485 
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Table Text Block]
The following table presents a reconciliation of OGE Energy's equity in earnings (losses) of unconsolidated affiliates for the years ended December 31, 2020, 2019 and 2018. 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)."
Year Ended December 31,
(In millions)202020192018
Enable net income$52.0 $360.0 $485.3 
OGE Energy's percent ownership at period end25.5 %25.5 %25.6 %
OGE Energy's portion of Enable net income$13.2 $91.8 $124.4 
Amortization of basis difference and dilution recognition (A)98.8 22.1 28.4 
Impairment of OGE Energy's equity method investment in Enable(780.0)— — 
Equity in earnings (losses) of unconsolidated affiliates (B)$(668.0)$113.9 $152.8 
(A) Includes loss on dilution, net of proportional basis difference recognition.
(B)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.
Reconciliation of Basis Difference [Table Text Block]
The following table presents a reconciliation of the difference between OGE Energy's investment in Enable and its underlying equity in the net assets of Enable (basis difference) from December 31, 2019 to December 31, 2020. The basis difference is being amortized over approximately 30 years.
(In millions)
Basis difference at December 31, 2019$652.5 
Amortization of basis difference (A)(100.2)
Impairment of OGE Energy's equity method investment in Enable780.0 
Basis difference at December 31, 2020$1,332.3 
(A) Includes proportional basis difference recognition due to dilution.
Schedule of Related Party Transactions [Table Text Block] The following table presents summarized related party transactions between OG&E and Enable during the years ended December 31, 2020, 2019 and 2018.
Year Ended December 31,
(In millions)202020192018
Operating revenues:
Electricity to power electric compression assets$15.1 $15.9 $16.3 
Cost of sales:
Natural gas transportation services$32.8 $41.2 $37.9 
Natural gas purchases (sales)$2.7 $(6.0)$(3.2)