Noncontrolling Interest Owner (Details) (USD $)	3 Months Ended		9 Months Ended				3 Months Ended								9 Months Ended	3 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Nov. 01, 2011	Feb. 01, 2011	Sep. 30, 2011 OGE Holdings [Member] units	Nov. 01, 2011 OGE Holdings [Member] units		Oct. 03, 2011 OGE Holdings [Member] units		Feb. 01, 2011 OGE Holdings [Member] units		Dec. 31, 2010 OGE Holdings [Member] units	Sep. 30, 2011 Noncontrolling Interest	Sep. 30, 2011 ArcLight Group [Member] units	Nov. 01, 2011 ArcLight Group [Member] units		Oct. 03, 2011 ArcLight Group [Member] units		Feb. 01, 2011 ArcLight Group [Member] units		Dec. 31, 2010 ArcLight Group [Member] units	Nov. 01, 2011 Enogex Holdings [Member] units		Oct. 03, 2011 Enogex Holdings [Member] units		Sep. 30, 2011 Enogex Holdings [Member] units	Feb. 01, 2011 Enogex Holdings [Member] units		Dec. 31, 2010 Enogex Holdings [Member] units
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Period Start, Total Ownership Percentage			100.00%		100.00%
Beginning period, balance								93,800,000						90,100,000			21,600,000						9,900,000	115,400,000				104,300,000			100,000,000
Ownership percentage, OGE Holdings, at beginning of period								81.30%						90.10%
Ownership percentage, ArcLight Group, at beginning of period																	18.70%						9.90%
Sale of 100,000 units of Enogex Holdings												(100,000)	[1]								100,000	[1]							0	[1]
Issuance of units of Enogex Holdings								2,900,000	[2]	500,000	[3]	400,000	[4]				2,800,000	[2]	4,900,000	[3]	3,900,000	[4]		5,700,000	[2]	5,400,000	[3]		4,300,000	[4]
Ending period, balance							90,400,000	93,800,000						90,100,000		13,900,000	21,600,000						9,900,000	115,400,000				104,300,000			100,000,000
Ownership percentage, OGE Holdings, at end of period							86.70%	81.30%						90.10%
Ownership Percentage, ArcLight Group, at end of period																13.30%	18.70%						9.90%
Ending Period, Total Ownership Percentage	100.00%		100.00%		100.00%
Percentage of Subsidiary Sold to Noncontrolling Interest						0.10%
Proceeds of Percentage of Subsidiary Sold to Noncontrolling Interest						$ 1,900,000
Contributions Towards Meeting 2011 Capital Requirements										10,000,000		8,000,000							90,000,000		71,600,000
Net Income Attributable to OGE Energy	178,700,000	163,100,000	306,500,000	264,600,000
Increase in paid-in capital for sale of 100,000 units of Enogex Holdings	0		900,000
Limited Liability Corp Units Sold																													100,000
Increase in paid-in capital for issuance of 4,303,007 units of Enogex Holdings			28,200,000
Limited Liability Corp Units Issued																								5,725,190		5,405,406			4,303,007
Decrease in paid-in capital for deferred income taxes attributable to the sale and issuance of units of Enogex Holdings			(11,200,000)												0
Net transfers from the noncontrolling interest			17,900,000
Change from net income attributable to OGE Energy and transfers from noncontrolling interest			324,400,000
Contributions for Gas Gathering Acquisitions								53,000,000	[5]								53,000,000	[5]
Contributions Towards Meeting Capital Requirements							$ 0									$ 0

[1] On February 1, 2011, OGE Energy sold a 0.1 percent membership interest in Enogex Holdings to the ArcLight group for $1.9 million.

[2] On November 1, 2011, OGE Energy and the ArcLight group made contributions of $53.0 million each to fund Enogex's gas gathering acquisitions as discussed in Note 17.

[3] On October 3, 2011, OGE Energy and the ArcLight group made contributions of $10.0 million and $90.0 million, respectively, to fund a portion of Enogex LLC's 2011 capital requirements.

[4] On February 1, 2011, OGE Energy and the ArcLight group made contributions of $8.0 million and $71.6 million, respectively, to fund a portion of Enogex LLC's 2011 capital requirements.

[5] (D) On November 1, 2011, OGE Energy and the ArcLight group made contributions of $53.0 million each to fund Enogex's gas gathering acquisitions as discussed in Note 17.