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Investment in Unconsolidated Affiliates (Tables)
 2 Months Ended
Jun. 30, 2013
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block]
As OGE Energy's interest in Enogex Holdings was deconsolidated on May 1, 2013, related party transactions between the Company and its affiliate, Enable Midstream Partners, after May 1, 2013, which were previously eliminated in consolidation, are discussed below.
 
Two Months Ended
 
June 30,
(In millions)
2013
Operating Revenues:
 
Electricity to power electric compression assets
$
1.3

Cost of Goods Sold:
 
Natural gas transportation services
$
5.8

Natural gas storage services
2.3

Natural gas purchases (A)
2.5

(A)
At June 30, 2013, there was $1.2 million of natural gas purchases recorded for these activities.