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Report of Business Segments (Tables)
12 Months Ended
Dec. 31, 2021
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, 2021, 2020 and 2019.
2021Electric UtilityNatural Gas Midstream OperationsOther
Operations
EliminationsTotal
(In millions)     
Operating revenues$3,653.7 $ $ $ $3,653.7 
Fuel, purchased power and direct transmission expense2,127.6    2,127.6 
Other operation and maintenance464.7 1.6 (3.2) 463.1 
Depreciation and amortization416.0    416.0 
Taxes other than income99.3 0.2 3.3  102.8 
Operating income (loss)546.1 (1.8)(0.1) 544.2 
Equity in earnings of unconsolidated affiliates 169.8   169.8 
Gain on Enable/Energy Transfer transaction, net 344.4   344.4 
Other income (expense)7.7 (26.4)(2.0)(0.9)(21.6)
Interest expense152.0  7.2 (0.9)158.3 
Income tax expense (benefit)41.8 101.0 (1.6) 141.2 
Net income (loss)$360.0 $385.0 $(7.7)$ $737.3 
Total assets$11,688.0 $786.6 $350.3 $(218.5)$12,606.4 
Capital expenditures$778.5 $ $ $ $778.5 
2020Electric UtilityNatural Gas Midstream OperationsOther
Operations
EliminationsTotal
(In millions)     
Operating revenues$2,122.3 $— $— $— $2,122.3 
Fuel, purchased power and direct transmission expense644.6 — — — 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 $— $— $374.3 
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 
Fuel, purchased power and direct transmission expense786.9 — — — 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 $— $— $1,132.9 
Total assets$10,076.6 $1,135.4 $107.0 $(294.7)$11,024.3 
Capital expenditures$635.5 $— $— $— $635.5