Investment in Unconsolidated Affiliate and Related Party Transactions (Tables)

8 Months Ended

Dec. 31, 2013

Investment in Unconsolidated Affiliate and Related Party Transaction [Abstract]

Schedule of Related Party Transactions [Table Text Block]

Related Party Transactions with Enable

	Eight Months Ended
(In millions)	December 31, 2013
Operating Revenues:
Electricity to power electric compression assets	$	7.7
Cost of Sales:
Natural gas transportation services	$	23.2
Natural gas storage services	8.6
Natural gas purchases	14.8

Summarized Balance Sheet Financial Information, Equity Method Investment [Table Text Block]

As Enable began operations on May 1, 2013, summarized unaudited financial information for 100 percent of Enable is presented below at December 31, 2013 and for the eight months ended December 31, 2013.

Balance Sheet	December 31, 2013
	(In millions)
Current assets	$	549
Non-current assets	10,683
Current liabilities	720
Non-current liabilities	2,331

Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block]

	Eight Months Ended
Income Statement	December 31, 2013
	(In millions)
Operating revenues	$	2,122.6
Cost of sales	1,240.5
Operating income	321.9
Net income	288.6

Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Table Text Block]

	Eight Months Ended
Reconciliation of Equity in Earnings of Unconsolidated Affiliates	December 31, 2013
	(In millions)
OGE's 28.5% share of Enable Net Income	$	82.1
Amortization of basis difference	9.4
Elimination of Enogex Holdings fair value and other adjustments	10.4
OGE's Equity in earnings of unconsolidated affiliates	$	101.9