Investment in Unconsolidated Affiliate and Related Party Transactions (Tables)

3 Months Ended

Mar. 31, 2016

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Related Party Transactions [Table Text Block]

The following table summarizes related party transactions between OG&E and Enable during thethree months endedMarch 31, 2016, and 2015.

	Three Months Ended March 31,
(In millions)	2016		2015
Operating Revenues:
Electricity to power electric compression assets	$	2.3	$	3.1
Cost of Sales:
Natural gas transportation services	$	8.8	$	8.8
Natural gas purchases/(sales)	1.5		2.5

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

Summarized unaudited financial information for 100 percent of Enable is presented below as of March 31, 2016 and December 31, 2015.

Balance Sheet	March 31,		December 31,
(In millions)	2016		2015
Current assets	$	379	$	381
Non-current assets	10,870		10,857
Current liabilities	279		615
Non-current liabilities	3,123		3,092

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

Income Statement	Three Months Ended March 31,
(In millions)	2016		2015
Operating revenues	$	509	$	616
Cost of NGLs	195		292
Operating income	103		104
Net income	86		91

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

The following table reconciles the Company's equity in earnings of its unconsolidated affiliates for the three months endedMarch 31, 2016 and 2015.

	Three Months Ended March 31,
(In millions)	2016		2015
OGE's share of Enable Net Income	$	21.3	$	23.8
Amortization of basis difference	2.9		3.5
Elimination of Enogex Holdings fair value and other adjustments	4.1		4.4
Equity in earnings of unconsolidated affiliates	$	28.3	$	31.7