CONSOLIDATED STATEMENTS OF CAPITALIZATION (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Senior Notes [Member] Series Due November 15, 2014 [Member] OGE Energy [Member]	Dec. 31, 2012 Senior Notes [Member] Series Due January 15, 2016 [Member] OG&E [Member]	Dec. 31, 2012 Senior Notes [Member] Series Due July 15, 2017 [Member] OG&E [Member]	Dec. 31, 2012 Senior Notes [Member] Series Due September 1, 2018 [Member] OG&E [Member]	Dec. 31, 2012 Senior Notes [Member] Series Due January 15, 2019 [Member] OG&E [Member]	Dec. 31, 2012 Senior Notes [Member] Series Due July 15, 2027 [Member] OG&E [Member]	Dec. 31, 2012 Senior Notes [Member] Series Due April 15, 2028 [Member] OG&E [Member]	Dec. 31, 2012 Senior Notes [Member] Series Due August 1, 2034 [Member] OG&E [Member]	Dec. 31, 2012 Senior Notes [Member] Series Due January 15, 2036 [Member] OG&E [Member]	Dec. 31, 2012 Senior Notes [Member] Series Due February 1, 2038 [Member] OG&E [Member]	Dec. 31, 2012 Senior Notes [Member] Series Due June 1, 2040 [Member] OG&E [Member]	Dec. 31, 2012 Senior Notes [Member] Senior Notes due May 15, 2041 [Member] OG&E [Member]	Dec. 31, 2012 Senior Notes [Member] Series Due July 15, 2014 [Member] Enogex LLC [Member]	Dec. 31, 2012 Senior Notes [Member] Series Due August 2, 2015 [Member] Enogex LLC [Member]	Dec. 31, 2012 Senior Notes [Member] Series Due March 15, 2020 [Member] Enogex LLC [Member]	Dec. 31, 2012 Long-term Debt [Member] Due August 31, 2062 [Member] OG&E [Member]
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	225.0
Common Stock, Shares, Outstanding	98.8	98.1
Treasury Stock, Shares	0.1	0.1
Debt Instrument, Maturity Date			Nov. 15, 2014	Jan. 15, 2016	Jul. 15, 2017	Sep. 01, 2018	Jan. 15, 2019	Jul. 15, 2027	Apr. 15, 2028	Aug. 01, 2034	Jan. 15, 2036	Feb. 01, 2038	Jun. 01, 2040	May 15, 2041	Jul. 15, 2014	Aug. 02, 2015	Mar. 15, 2020	Aug. 31, 2062