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Investment in Unconsolidated Affiliates Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified |  |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2013 Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2014 Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2013 Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2014 Operating Costs Charged [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2013 Operating Costs Charged [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2014 Operating Costs Charged [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2013 Operating Costs Charged [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2014 Natural Gas Transportation [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2013 Natural Gas Transportation [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2014 Natural Gas Transportation [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2013 Natural Gas Transportation [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2014 Natural Gas Storage [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2013 Natural Gas Storage [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2014 Natural Gas Storage [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2013 Natural Gas Storage [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2014 Natural Gas Purchases [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2013 Natural Gas Purchases [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2014 Natural Gas Purchases [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2013 Natural Gas Purchases [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2014 Employment Costs [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2013 Employment Costs [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2014 Employment Costs [Member] Enable Midstream Partners [Member] Og and E [Member] | Jun. 30, 2013 Employment Costs [Member] Enable Midstream Partners [Member] Og and E [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  | $ 3.8 | $ 4.3 | $ 9.8 | $ 4.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22.2 | $ 16.8 | $ 53.0 | $ 16.8
Electricity to power electric compression assets |  |  | 3.3 | 1.3 | 6.0 | 1.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Purchases from Related Party |  |  |  |  |  |  |  |  |  |  | 8.7 | 5.8 | 17.4 | 5.8 | 1.1 | 2.3 | 4.4 | 2.3 | (1.4) | [1] | 2.5 | [1] | 3.5 | [1] | 2.5 | [1] |  |  |  |
Accounts receivable - unconsolidated affiliates | $ 7.4 | $ 12.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | OG&E entered into a new contract with Enable to provide transportation services effective May 1, 2014 which also eliminated the natural gas storage services. 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.

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- Definition Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
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- Definition Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party. + References No definition available. + Details
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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Related Parties -URI http://asc.fasb.org/extlink&oid=16382449 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 07 -Paragraph b -Subparagraph 1 -Article 6 + Details
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