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Investment in Unconsolidated Affiliates (Tables) | 9 Months Ended
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Sep. 30, 2018
Reconciliation of Basis Difference [Line Items] |
Reconciliation of Basis Difference [Table Text Block] | The following table reconciles the basis difference in Enable from December 31, 2017 to September 30, 2018.
(In millions) |  |
Basis difference at December 31, 2017 |  | $ | 714.2 |
Change in Enable basis difference |  | (3.2 | )
Amortization of basis difference |  | (8.4 | )
Elimination of Enable fair value step up |  | (12.9 | )
Basis difference at September 30, 2018 |  | $ | 689.7 |
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Table Text Block] | The following table reconciles the Company's equity in earnings of unconsolidated affiliates for the three and nine months ended September 30, 2018 and 2017.
| Three Months Ended | Nine Months Ended
| September 30, | September 30,
(In millions) | 2018 | 2017 | 2018 | 2017
Enable net income | $ | 129.0 |  | $ | 104.0 |  | $ | 320.0 |  | $ | 301.0 |
OGE Energy's percent ownership at period end | 25.6 | % | 25.7 | % | 25.6 | % | 25.7 | %
OGE Energy's portion of Enable net income | 33.0 |  | 26.5 |  | 82.0 |  | 77.2 |
Amortization of basis difference | 2.8 |  | 2.8 |  | 8.4 |  | 8.5 |
Elimination of Enable fair value step up | 4.3 |  | 4.3 |  | 12.9 |  | 12.9 |
Equity in earnings of unconsolidated affiliates | $ | 40.1 |  | $ | 33.6 |  | $ | 103.3 |  | $ | 98.6 |
Schedule of Related Party Transactions [Table Text Block] | The following table summarizes related party transactions between OG&E and Enable during the three and nine months ended September 30, 2018 and 2017.
| Three Months Ended | Nine Months Ended
| September 30, | September 30,
(In millions) | 2018 | 2017 | 2018 | 2017
Operating revenues: |  |  |  |
Electricity to power electric compression assets | $ | 4.7 |  | $ | 4.5 |  | $ | 12.2 |  | $ | 10.0 |
Cost of sales: |  |  |  |
Natural gas transportation services | $ | 8.8 |  | $ | 8.8 |  | $ | 26.3 |  | $ | 26.3 |
Natural gas purchases (sales) | $ | 0.1 |  | $ | 0.4 |  | $ | 2.6 |  | $ | (0.4 | )
Summarized Balance Sheet Financial Information, Equity Method Investment [Table Text Block] | Summarized unaudited financial information for 100 percent of Enable is presented below at September 30, 2018 and December 31, 2017 and for the three and nine months ended September 30, 2018 and 2017.
| September 30, | December 31,
Balance Sheet | 2018 | 2017
(In millions) |
Current assets | $ | 481 |  | $ | 416 |
Non-current assets | $ | 11,454 |  | $ | 11,177 |
Current liabilities | $ | 1,403 |  | $ | 1,279 |
Non-current liabilities | $ | 2,964 |  | $ | 2,660 |
Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block] |
| Three Months Ended | Nine Months Ended
| September 30, | September 30,
Income Statement | 2018 | 2017 | 2018 | 2017
(In millions) |
Total revenues | $ | 928 |  | $ | 705 |  | $ | 2,481 |  | $ | 1,997 |
Cost of natural gas and NGLs | $ | 516 |  | $ | 349 |  | $ | 1,335 |  | $ | 936 |
Operating income | $ | 171 |  | $ | 137 |  | $ | 436 |  | $ | 399 |
Net income | $ | 129 |  | $ | 104 |  | $ | 320 |  | $ | 301 |

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