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Report of Business Segments (Tables)
12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block] The following tables present the results of OGE Energy's business segments for the years ended December 31, 2020, 2019 and 2018.
2020Electric UtilityNatural Gas Midstream OperationsOther
Operations
EliminationsTotal
(In millions)     
Operating revenues$2,122.3 $ $ $ $2,122.3 
Cost of sales644.6    644.6 
Other operation and maintenance464.4 1.7 (3.3) 462.8 
Depreciation and amortization391.3    391.3 
Taxes other than income97.2 0.4 3.8  101.4 
Operating income (loss)524.8 (2.1)(0.5) 522.2 
Equity in losses of unconsolidated affiliates (A) (668.0)  (668.0)
Other income (expense)4.1 (2.9)3.6 (1.6)3.2 
Interest expense154.8  5.3 (1.6)158.5 
Income tax expense (benefit)34.7 (158.0)(4.1) (127.4)
Net income (loss)$339.4 $(515.0)$1.9 $ $(173.7)
Investment in unconsolidated affiliates$ $374.3 $23.1 $ $397.4 
Total assets$10,489.0 $378.1 $116.4 $(264.7)$10,718.8 
Capital expenditures$650.5 $ $ $ $650.5 
(A) In March 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Notes 5 and 7.

2019Electric UtilityNatural Gas Midstream OperationsOther
Operations
EliminationsTotal
(In millions)     
Operating revenues$2,231.6 $— $— $— $2,231.6 
Cost of sales786.9 — — — 786.9 
Other operation and maintenance492.5 2.8 (3.5)— 491.8 
Depreciation and amortization355.0 — — — 355.0 
Taxes other than income89.5 0.4 3.7 — 93.6 
Operating income (loss)507.7 (3.2)(0.2)— 504.3 
Equity in earnings of unconsolidated affiliates— 113.9 — — 113.9 
Other income (expense)3.1 (8.6)2.2 (3.6)(6.9)
Interest expense140.5 — 11.0 (3.6)147.9 
Income tax expense (benefit)20.1 20.7 (11.0)— 29.8 
Net income$350.2 $81.4 $2.0 $— $433.6 
Investment in unconsolidated affiliates$— $1,132.9 $18.6 $— $1,151.5 
Total assets$10,076.6 $1,135.4 $107.0 $(294.7)$11,024.3 
Capital expenditures$635.5 $— $— $— $635.5 
2018Electric UtilityNatural Gas Midstream OperationsOther
Operations
EliminationsTotal
(In millions)
Operating revenues$2,270.3 $— $— $— $2,270.3 
Cost of sales892.5 — — — 892.5 
Other operation and maintenance473.8 1.4 (0.6)— 474.6 
Depreciation and amortization321.6 — — — 321.6 
Taxes other than income88.2 0.6 3.2 — 92.0 
Operating income (loss)494.2 (2.0)(2.6)— 489.6 
Equity in earnings of unconsolidated affiliates— 152.8 — — 152.8 
Other income (expense)25.6 (4.9)(3.4)(6.0)11.3 
Interest expense151.8 — 10.2 (6.0)156.0 
Income tax expense (benefit)40.0 37.1 (4.9)— 72.2 
Net income (loss)$328.0 $108.8 $(11.3)$— $425.5 
Investment in unconsolidated affiliates$— $1,166.6 $10.9 $— $1,177.5 
Total assets$9,704.5 $1,169.8 $184.8 $(310.5)$10,748.6 
Capital expenditures$573.6 $— $— $— $573.6