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Investment in Unconsolidated Affiliate and Related Party Transactions (Tables) | 3 Months Ended
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Mar. 31, 2016
Equity Method Investments and Joint Ventures [Abstract] |
Schedule of Related Party Transactions [Table Text Block] | The following table summarizes related party transactions between OG&E and Enable during the three months ended March 31, 2016, and 2015.
| Three Months Ended March 31,
(In millions) | 2016 | 2015
Operating Revenues: |  |
Electricity to power electric compression assets | $ | 2.3 |  | $ | 3.1 |
Cost of Sales: |  |
Natural gas transportation services | $ | 8.8 |  | $ | 8.8 |
Natural gas purchases/(sales) | 1.5 |  | 2.5 |
Summarized Balance Sheet Financial Information, Equity Method Investment [Table Text Block] | Summarized unaudited financial information for 100 percent of Enable is presented below as of March 31, 2016 and December 31, 2015.
Balance Sheet | March 31, | December 31,
(In millions) | 2016 | 2015
Current assets | $ | 379 |  | $ | 381 |
Non-current assets | 10,870 |  | 10,857 |
Current liabilities | 279 |  | 615 |
Non-current liabilities | 3,123 |  | 3,092 |
Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block] |
Income Statement | Three Months Ended March 31,
(In millions) | 2016 | 2015
Operating revenues | $ | 509 |  | $ | 616 |
Cost of NGLs | 195 |  | 292 |
Operating income | 103 |  | 104 |
Net income | 86 |  | 91 |
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Table Text Block] | The following table reconciles the Company's equity in earnings of its unconsolidated affiliates for the three months ended March 31, 2016 and 2015.
| Three Months Ended March 31,
(In millions) | 2016 | 2015
OGE's share of Enable Net Income | $ | 21.3 |  | $ | 23.8 |
Amortization of basis difference | 2.9 |  | 3.5 |
Elimination of Enogex Holdings fair value and other adjustments | 4.1 |  | 4.4 |
Equity in earnings of unconsolidated affiliates | $ | 28.3 |  | $ | 31.7 |

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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 Summarized Balance Sheet Financial Information, Equity Method Investment [Table Text Block] + References No definition available. + Details
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- Definition Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block] + 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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