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Investment in Unconsolidated Affiliates (Tables) | 9 Months Ended
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Sep. 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 (loss) of its unconsolidated affiliates for the three and nine months ended September 30, 2016 and 2015.
| Three Months Ended | Nine Months Ended
| September 30, | September 30,
Reconciliation of Equity in Earnings (Loss) of Unconsolidated Affiliates | 2016 | 2015 | 2016 | 2015
(In millions) |  |
Enable net income (loss) | $ | 110.1 |  | $ | (985.1 | ) | $ | 230.8 |  | $ | (817.3 | )
Distributions senior to limited partners | (9.1 | ) | — |  | (9.1 | ) | — |
Differences due to timing of OGE Energy and Enable accounting close and permanent items | 3.0 |  | 4.2 |  | (3.6 | ) | 9.9 |
Enable net income (loss) used to calculate OGE Energy's equity in earnings | $ | 104.0 |  | $ | (980.9 | ) | $ | 218.1 |  | $ | (807.4 | )
OGE Energy’s percent ownership | 26.3 | % | 26.3 | % | 26.3 | % | 26.3 | %
OGE Energy’s portion of Enable net income (loss) | $ | 27.3 |  | $ | (257.2 | ) | $ | 57.5 |  | $ | (212.0 | )
Impairments recognized by Enable associated with OGE Energy’s basis differences | — |  | 177.7 |  | 0.6 |  | 177.7 |
OGE Energy's share of Enable net income (loss) | $ | 27.3 |  | $ | (79.5 | ) | $ | 58.1 |  | $ | (34.3 | )
Amortization of basis difference | 2.9 |  | 3.5 |  | 8.8 |  | 10.6 |
Elimination of Enable fair value step up | 4.3 |  | 4.1 |  | 12.6 |  | 11.7 |
Equity in earnings (loss) of unconsolidated affiliates | $ | 34.5 |  | $ | (71.9 | ) | $ | 79.5 |  | $ | (12.0 | )
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, 2016 and 2015.
| Three Months Ended | Nine Months Ended
| September 30, | September 30,
(In millions) | 2016 | 2015 | 2016 | 2015
Operating Revenues: |  |  |  |
Electricity to power electric compression assets | $ | 3.7 |  | $ | 4.4 |  | $ | 9.0 |  | $ | 11.1 |
Cost of Sales: |  |  |  |
Natural gas transportation services | $ | 8.8 |  | $ | 8.8 |  | $ | 26.3 |  | $ | 26.3 |
Natural gas purchases/(sales) | 4.4 |  | 2.5 |  | 11.3 |  | 7.1 |
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, 2016 and December 31, 2015 and for the three and nine months ended September 30, 2016 and 2015.
| September 30, | December 31,
Balance Sheet | 2016 | 2015
(In millions) |
Current assets | $ | 408 |  | $ | 381 |
Non-current assets | 10,833 |  | 10,845 |
Current liabilities | 338 |  | 615 |
Non-current liabilities | 3,174 |  | 3,080 |
Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block] |
| Three Months Ended | Nine Months Ended
| September 30, | September 30,
Income Statement | 2016 | 2015 | 2016 | 2015
(In millions) |
Operating revenues | $ | 620 |  | $ | 646 |  | $ | 1,658 |  | $ | 1,852 |
Cost of natural gas and natural gas liquids | 268 |  | 287 |  | 717 |  | 856 |
Operating income | 139 |  | (975 | ) | 299 |  | (778 | )
Net income | 110 |  | (985 | ) | 231 |  | (817 | )

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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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