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Investment in Unconsolidated Affiliate and Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2016
Reconciliation of Basis Difference [Line Items]  
Reconciliation of Basis Difference [Table Text Block]
The following table reconciles the basis difference in Enable from December 31, 2015 to December 31, 2016.
(In millions)
 
 
Basis difference as of December 31, 2015
 
$
783.5

Dilution and impairments associated with OGE Energy’s basis difference
 
(11.3
)
Amortization of basis difference
 
(11.6
)
Elimination of Enable fair value step up
 
(16.9
)
Basis difference as of December 31, 2016
 
$
743.7
Schedule of Related Party Transactions [Table Text Block]
The following table summarizes related party transactions between OG&E and Enable during the years ended December 31, 2016, 2015 and 2014.

 
Year Ended December 31,
(In millions)
2016
2015
2014
Operating Revenues:
 
 
 
Electricity to power electric compression assets
$
11.5

$
13.8

$
13.3

Cost of Sales:
 
 
 
Natural gas transportation services
$
35.0

$
35.0

$
34.9

Natural gas storage services
—

—

4.4

Natural gas purchases/(sales)
11.2

7.6

8.7
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 December 31, 2016 and 2015 and for the years ended December 31, 2016, 2015 and 2014.

Balance Sheet
December 31,
(In millions)
2016
2015
Current assets
$
396

$
381

Non-current assets
10,816

10,845

Current liabilities
362

615

Non-current liabilities
3,056

3,080
Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block]
Income Statement
Year Ended December 31,
(In millions)
2016
2015
2014
Operating revenues
$
2,272

$
2,418

$
3,367

Cost of natural gas and natural gas liquids
1,017

1,097

1,914

Operating income (loss)
385

(712
)
586

Net income (loss)
290

(752
)
530
Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Table Text Block]
The following table reconciles OGE Energy's equity in earnings of its unconsolidated affiliates for the years ended December 31, 2016 and 2015.
 
Year Ended December 31,
Reconciliation of Equity in Earnings (Loss) of Unconsolidated Affiliates
2016
2015
(In millions)
 
 
Enable net income (loss)
$
289.5

$
(752.0
)
Distributions senior to limited partners
(9.1
)
—

Differences due to timing of OGE Energy and Enable accounting close
(12.1
)
12.1

Enable net income (loss) used to calculate OGE Energy's equity in earnings
$
268.3

$
(739.9
)
OGE Energy’s percent ownership at year end
25.7
%
26.3
%
OGE Energy’s portion of Enable net income (loss)
$
70.7

$
(194.4
)
Impairments recognized by Enable associated with OGE Energy’s basis differences
2.6

178.4

OGE Energy's share of Enable net income (loss)
73.3

(16.0
)
Amortization of basis difference
11.6

13.5

Elimination of Enable fair value step up
16.9

18.0

Equity in earnings of unconsolidated affiliates
$
101.8

$
15.5