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Report of Business Segments (Tables)
9 Months Ended
Sep. 30, 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 three and nine months ended September 30, 2021 and 2020.
Three Months Ended September 30, 2021Electric UtilityNatural Gas Midstream OperationsOther
Operations
EliminationsTotal
(In millions)     
Operating revenues$864.4 $ $ $ $864.4 
Fuel, purchased power and direct transmission expense330.1    330.1 
Other operation and maintenance115.8 0.3 (0.7) 115.4 
Depreciation and amortization108.6    108.6 
Taxes other than income24.6 0.1 0.8  25.5 
Operating income (loss)285.3 (0.4)(0.1) 284.8 
Equity in earnings of unconsolidated affiliates 41.2   41.2 
Other income (expense)2.9 (0.5)(0.2)(0.1)2.1 
Interest expense38.0  1.6 (0.1)39.5 
Income tax expense26.4 9.5 0.2  36.1 
Net income (loss)$223.8 $30.8 $(2.1)$ $252.5 
Investment in unconsolidated affiliates$ $449.5 $29.4 $ $478.9 
Total assets$11,597.9 $451.8 $293.3 $(165.5)$12,177.5 
Three Months Ended September 30, 2020Electric UtilityNatural Gas Midstream OperationsOther
Operations
EliminationsTotal
(In millions)     
Operating revenues$702.1 $— $— $— $702.1 
Fuel, purchased power and direct transmission expense209.1 — — — 209.1 
Other operation and maintenance110.1 0.3 (0.7)— 109.7 
Depreciation and amortization100.5 — — — 100.5 
Taxes other than income23.9 0.2 0.7 — 24.8 
Operating income (loss)258.5 (0.5)— — 258.0 
Equity in earnings of unconsolidated affiliates— 15.8 — — 15.8 
Other income (expense)0.6 (0.7)(0.5)(0.2)(0.8)
Interest expense39.5 — 0.5 (0.2)39.8 
Income tax expense20.1 4.5 31.2 — 55.8 
Net income (loss)$199.5 $10.1 $(32.2)$— $177.4 
Investment in unconsolidated affiliates$— $355.8 $21.0 $— $376.8 
Total assets$10,323.3 $358.7 $109.6 $(294.0)$10,497.6 
Nine Months Ended September 30, 2021Electric UtilityNatural Gas Midstream OperationsOther
Operations
EliminationsTotal
(In millions)     
Operating revenues$3,072.4 $ $ $ $3,072.4 
Fuel, purchased power and direct transmission expense1,876.9    1,876.9 
Other operation and maintenance344.4 2.3 (2.8) 343.9 
Depreciation and amortization310.2    310.2 
Taxes other than income75.3 0.3 2.9  78.5 
Operating income (loss)465.6 (2.6)(0.1) 462.9 
Equity in earnings of unconsolidated affiliates 127.9   127.9 
Other income (expense)5.8 (1.2)(0.8)(0.9)2.9 
Interest expense114.3  5.4 (0.9)118.8 
Income tax expense (benefit)37.0 23.2 (3.4) 56.8 
Net income (loss)$320.1 $100.9 $(2.9)$ $418.1 
Investment in unconsolidated affiliates$ $449.5 $29.4 $ $478.9 
Total assets$11,597.9 $451.8 $293.3 $(165.5)$12,177.5 
Nine Months Ended September 30, 2020Electric UtilityNatural Gas Midstream OperationsOther
Operations
EliminationsTotal
(In millions)     
Operating revenues$1,636.9 $— $— $— $1,636.9 
Fuel, purchased power and direct transmission expense481.5 — — — 481.5 
Other operation and maintenance348.8 1.2 (2.8)— 347.2 
Depreciation and amortization292.2 — — — 292.2 
Taxes other than income72.8 0.4 3.1 — 76.3 
Operating income (loss)441.6 (1.6)(0.3)— 439.7 
Equity in losses of unconsolidated affiliates (A)— (703.8)— — (703.8)
Other income (expense)2.9 (0.7)2.5 (1.4)3.3 
Interest expense115.7 — 4.6 (1.4)118.9 
Income tax expense (benefit)30.5 (167.2)(14.5)— (151.2)
Net income (loss)$298.3 $(538.9)$12.1 $— $(228.5)
Investment in unconsolidated affiliates$— $355.8 $21.0 $— $376.8 
Total assets$10,323.3 $358.7 $109.6 $(294.0)$10,497.6 
(A) In 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Note 4