Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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- Definition

The cash inflow from parent as a source of financing that is recorded as additional paid in capital.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 57

-Paragraph 2

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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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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Summary of Significant Accounting Policies Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended		3 Months Ended		6 Months Ended			12 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Operating Costs Charged [Member] Og and E [Member]	Jun. 30, 2011 Operating Costs Charged [Member] Og and E [Member]	Jun. 30, 2012 Operating Costs Charged [Member] Og and E [Member]	Jun. 30, 2011 Operating Costs Charged [Member] Og and E [Member]	Jun. 30, 2012 OGE Holdings [Member] Natural Gas Purchases [Member] Enogex [Member]	Dec. 31, 2011 OGE Holdings [Member] Natural Gas Purchases [Member] Enogex [Member]	Jun. 30, 2012 Og and E [Member] Natural Gas Transportation [Member] Enogex [Member]	Jun. 30, 2011 Og and E [Member] Natural Gas Transportation [Member] Enogex [Member]	Jun. 30, 2012 Og and E [Member] Natural Gas Transportation [Member] Enogex [Member]	Jun. 30, 2011 Og and E [Member] Natural Gas Transportation [Member] Enogex [Member]	Jun. 30, 2012 Og and E [Member] Natural Gas Purchases [Member] Enogex [Member]	Jun. 30, 2011 Og and E [Member] Natural Gas Purchases [Member] Enogex [Member]	Jun. 30, 2012 Og and E [Member] Natural Gas Purchases [Member] Enogex [Member]	Jun. 30, 2011 Og and E [Member] Natural Gas Purchases [Member] Enogex [Member]	Jun. 30, 2012 Og and E [Member] Natural Gas Storage [Member] Enogex [Member]	Jun. 30, 2011 Og and E [Member] Natural Gas Storage [Member] Enogex [Member]	Jun. 30, 2012 Og and E [Member] Natural Gas Storage [Member] Enogex [Member]	Jun. 30, 2011 Og and E [Member] Natural Gas Storage [Member] Enogex [Member]	Jun. 30, 2012 Physical [Member] Derivative Purchases [Member] Designated as Hedging Instrument [Member] Natural Gas [Member] mmbtu
Related Party Transaction, Expenses from Transactions with Related Party									$ 8.7	$ 8.7	$ 17.4	$ 17.4					$ 3.2	$ 3.2	$ 6.4	$ 6.4
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party			27.5	33.4	60.2	64.4
Related Party Transaction, Purchases from Related Party							1.9	1.7					6.0	8.9	9.6	21.4
Capital contribution from OGE Energy	$ 0	$ 50.0
Derivative, Nonmonetary Notional Amount																					50,000