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Investment in Unconsolidated Affiliates (Tables) | 6 Months Ended
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Jun. 30, 2016
Related Party Transactions [Abstract] |
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 and six months ended June 30, 2016 and 2015.
| Three Months Ended | Six Months Ended
| June 30, | June 30,
Reconciliation of Equity in Earnings of Unconsolidated Affiliates | 2016 | 2015 | 2016 | 2015
(In millions) |  |
OGE's share of Enable net income | $ | 9.1 |  | $ | 20.6 |  | $ | 30.4 |  | $ | 44.4 |
Amortization of basis difference | 3.0 |  | 3.6 |  | 5.9 |  | 7.1 |
Elimination of Enogex Holdings fair value and other adjustments | 4.6 |  | 4.0 |  | 8.7 |  | 8.4 |
Equity in earnings of unconsolidated affiliates | $ | 16.7 |  | $ | 28.2 |  | $ | 45.0 |  | $ | 59.9 |
Schedule of Related Party Transactions [Table Text Block] | The following table summarizes related party transactions between OG&E and Enable, during the three and six months ended June 30, 2016 and 2015.
| Three Months Ended | Six Months Ended
| June 30, | June 30,
(In millions) | 2016 | 2015 | 2016 | 2015
Operating Revenues: |  |  |  |
Electricity to power electric compression assets | $ | 3.0 |  | $ | 3.6 |  | $ | 5.3 |  | $ | 6.7 |
Cost of Sales: |  |  |  |
Natural gas transportation services | $ | 8.8 |  | $ | 8.7 |  | $ | 17.5 |  | $ | 17.5 |
Natural gas purchases/(sales) | 5.4 |  | 2.1 |  | 6.9 |  | 4.6 |
Summarized Balance Sheet Financial Information, Equity Method Investment [Table Text Block] | Summarized unaudited financial information for 100 percent of Enable is presented below at June 30, 2016 and December 31, 2015 and for the three and six months ended June 30, 2016 and 2015.
| June 30, | December 31,
Balance Sheet | 2016 | 2015
(In millions) |
Current assets | $ | 349 |  | $ | 381 |
Non-current assets | 10,851 |  | 10,845 |
Current liabilities | 301 |  | 615 |
Non-current liabilities | 3,150 |  | 3,080 |
Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block] |
| Three Months Ended | Six Months Ended
| June 30, | June 30,
Income Statement | 2016 | 2015 | 2016 | 2015
(In millions) |
Operating revenues | $ | 529 |  | $ | 590 |  | $ | 1,038 |  | $ | 1,206 |
Cost of natural gas and natural gas liquids | 254 |  | 277 |  | 449 |  | 569 |
Operating income | 57 |  | 93 |  | 160 |  | 197 |
Net income | 35 |  | 77 |  | 121 |  | 168 |

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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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