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Investment in Unconsolidated Affiliate and Related Party Transactions (Tables) | 12 Months Ended
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Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract] |
Schedule of Related Party Transactions [Table Text Block] | OG&E entered into a new contract with Enable to provide transportation services effective May 1, 2014 which eliminated the natural gas storage services. This transportation agreement grants Enable the responsibility of delivering natural gas to OG&E’s generating facilities and performing an imbalance service. With this imbalance service, in accordance with the cash-out provision of the contract, OG&E purchases gas from Enable when Enable’s deliveries exceed OG&E’s pipeline receipts. Enable purchases gas from OG&E when OG&E’s pipeline receipts exceed Enable’s deliveries. The following table summarizes related party transactions between OG&E and Enable during the years ended December 31, 2015, 2014 and the eight months ended December 31, 2013.
| Year Ended December 31,
(In millions) | 2015 | 2014 | 2013
Operating Revenues: |  |  |
Electricity to power electric compression assets | $ | 13.8 |  | $ | 13.3 |  | $ | 7.7 |
Cost of Sales: |  |  |
Natural gas transportation services | $ | 35.0 |  | $ | 34.9 |  | $ | 23.2 |
Natural gas storage services | — |  | 4.4 |  | 8.6 |
Natural gas purchases/(sales) | 7.6 |  | 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 for the years ended December 31, 2015 and 2014 and for the eight months ended December 31, 2013.
Balance Sheet | December 31,
(In millions) | 2015 | 2014
Current assets | $ | 381 |  | $ | 438 |
Non-current assets | 10,857 |  | 11,399 |
Current liabilities | 615 |  | 671 |
Non-current liabilities | 3,092 |  | 2,344 |
Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block] |
Income Statement | Year Ended December 31,
(In millions) | 2015 | 2014 | 2013
Operating revenues | $ | 2,418 |  | $ | 3,367 |  | $ | 2,123 |
Cost of natural gas and natural gas liquids | 1,097 |  | 1,914 |  | 1,241 |
Operating income (loss) | (712 | ) | 586 |  | 322 |
Net income (loss) | (752 | ) | 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, 2015 and 2014.
| Year Ended December 31,
(In millions) | 2015 | 2014
OGE's share of Enable Net Income (Loss) | $ | (16.0 | ) | $ | 143.1 |
Amortization of basis difference | 13.5 |  | 14.0 |
Elimination of Enogex Holdings fair value and other adjustments | 18.0 |  | 15.5 |
Equity in earnings of unconsolidated affiliates | $ | 15.5 |  | $ | 172.6 |

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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 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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