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Investment in Unconsolidated Affiliate and Related Party Transactions (Tables) | 12 Months Ended
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Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract] |
Schedule of Related Party Transactions [Table Text Block] | Related Party Transactions with Enable
| Year Ended
(In millions) | December 31, 2014 | December 31, 2013
Operating Revenues: |  |
Electricity to power electric compression assets | $ | 13.3 |  | $ | 7.7 |
Cost of Sales: |  |
Natural gas transportation services | $ | 34.9 |  | $ | 23.2 |
Natural gas storage services | 4.4 |  | 8.6 |
Natural gas purchases | 8.7 |  | 14.8 |
Summarized Balance Sheet Financial Information, Equity Method Investment [Table Text Block] | Summarized unaudited financial information for 100 percent of Enable is presented below at December 31, 2014 and for the eight months ended December 31, 2013.
Balance Sheet | Year Ended December 31,
(In millions) | 2014 | 2013
Current assets | $ | 438 |  | $ | 549 |
Non-current assets | 11,399 |  | 10,683 |
Current liabilities | 671 |  | 720 |
Non-current liabilities | 2,344 |  | 2,331 |
Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block] |
Income Statement | Year Ended December 31,
(In millions) | 2014 | 2013
Operating revenues | $ | 3,367 |  | $ | 2,123 |
Cost of sales | 1,914 |  | 1,241 |
Operating income | 586 |  | 322 |
Net income attributable to Enable | 530 |  | 289 |
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Table Text Block] | The following table reconciles OGE Energy's equity in earnings of its unconsolidated affiliates for the years ended December 31, 2014 and 2013.
| Year Ended December 31,
(In millions) | 2014 | 2013
OGE's share of Enable Net Income | $ | 143.1 |  | $ | 82.1 |
Amortization of basis difference | 14.0 |  | 9.4 |
Elimination of Enogex Holdings fair value and other adjustments | 15.5 |  | 10.4 |
OGE's Equity in earnings of unconsolidated affiliates | $ | 172.6 |  | $ | 101.9 |

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- Definition [Table Text Block] for Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Table] + References No definition available. + Details
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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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