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Investment in Unconsolidated Affiliate and Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]  
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, 2018 and 2017 and for the years ended December 31, 2018, 2017 and 2016.

Balance Sheet
December 31,
(In millions)
2018
2017
Current assets
$
449

$
416

Non-current assets
$
11,995

$
11,177

Current liabilities
$
1,615

$
1,279

Non-current liabilities
$
3,211

$
2,660
Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block]
Income Statement
Year Ended December 31,
(In millions)
2018
2017
2016
Total revenues
$
3,431

$
2,803

$
2,272

Cost of natural gas and NGLs
$
1,819

$
1,381

$
1,017

Operating income
$
648

$
528

$
385

Net income
$
485

$
400

$
290
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, 2018, 2017 and 2016, respectively.
 
Year Ended December 31,
(In millions)
2018
2017
2016
Enable net income
$
485.3

$
400.3

$
289.5

Distributions senior to limited partners
—

—

(9.1
)
Differences due to timing of OGE Energy and Enable accounting close
—

—

(12.2
)
Enable net income used to calculate OGE Energy's equity in earnings
$
485.3

$
400.3

$
268.2

OGE Energy's percent ownership at period end
25.6
%
25.7
%
25.7
%
OGE Energy's portion of Enable net income
$
124.4

$
102.7

$
70.7

Impairments recognized by Enable associated with OGE Energy's basis difference
—

—

2.6

OGE Energy's share of Enable net income
124.4

102.7

73.3

Amortization of basis difference
11.2

11.3

11.6

Elimination of Enable fair value step up
17.2

17.2

16.9

Equity in earnings of unconsolidated affiliates
$
152.8

$
131.2

$
101.8
Reconciliation of Basis Difference [Table Text Block]
The difference between OGE Energy's investment in Enable and its underlying equity in the net assets of Enable was $680.3 million as of December 31, 2018. The following table reconciles the basis difference in Enable from December 31, 2017 to December 31, 2018.

(In millions)
 
Basis difference at December 31, 2017
$
714.2

Change in Enable basis difference
(5.5
)
Amortization of basis difference
(11.2
)
Elimination of Enable fair value step up
(17.2
)
Basis difference at December 31, 2018
$
680.3
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, 2018, 2017 and 2016.

 
Year Ended December 31,
(In millions)
2018
2017
2016
Operating revenues:
 
 
 
Electricity to power electric compression assets
$
16.3

$
14.0

$
11.5

Cost of sales:
 
 
 
Natural gas transportation services
$
37.9

$
35.0

$
35.0

Natural gas (sales) purchases
$
(3.2
)
$
(2.1
)
$
11.2