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Reportable Business Segments (Tables)
 12 Months Ended
Dec. 31, 2016
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Financial data for business segments and products and services are as follows:

 
Revenues
from
External
Customers
 
Intersegment
Revenues
 
Depreciation
and
Amortization
 
Operating
Income
(Loss)
 
Total Assets (1)
 
Expenditures
for Long-
Lived Assets
 
(in millions)
As of and for the year ended December 31, 2016:
 

 
 

 
 

 
 

 
 

 
 

Natural Gas Distribution
$
2,380

 
$
29

 
$
242

 
$
303

 
$
6,099

 
$
510

Energy Services
2,073

 
26

 
7

 
20

 
1,102

 
5

Midstream Investments (2)
—

 
—

 
—

 
—

 
2,505

 
—

Other
1

 
—

 
—

 
(5
)
 
75

 
—

Reconciling Eliminations
—

 
(55
)
 
—

 
—

 
(563
)
 
—

Consolidated
$
4,454

 
$
—

 
$
249

 
$
318

 
$
9,218

 
$
515

As of and for the year ended December 31, 2015:
 

 
 

 
 

 
 

 
 

 
 

Natural Gas Distribution
$
2,603

 
$
29

 
$
222

 
$
273

 
$
5,657

 
$
601

Energy Services
1,924

 
33

 
5

 
42

 
857

 
5

Midstream Investments (2)
—

 
—

 
—

 
—

 
2,594

 
—

Other
—

 
—

 
—

 
(2
)
 
777

 
—

Reconciling Eliminations
—

 
(62
)
 
—

 
—

 
(744
)
 
—

Consolidated
$
4,527

 
$
—

 
$
227

 
$
313

 
$
9,141

 
$
606

As of and for the year ended December 31, 2014:
 

 
 

 
 

 
 

 
 

 
 

Natural Gas Distribution
$
3,271

 
$
30

 
$
201

 
$
287

 
$
5,464

 
$
525

Energy Services
3,095

 
84

 
5

 
52

 
978

 
3

Midstream Investments (2)
—

 
—

 
—

 
—

 
4,521

 
—

Other
1

 
—

 
—

 
(4
)
 
1,031

 
—

Reconciling Eliminations
—

 
(114
)
 
—

 
—

 
(964
)
 
—

Consolidated
$
6,367

 
$
—

 
$
206

 
$
335

 
$
11,030

 
$
528


(1)
Amounts for 2015 and 2014 have been restated to reflect the adoption of ASU 2015-03.

(2)
Midstream Investments’ equity earnings (losses) are as follows:
 
 
Year Ended December 31,
 
 
2016
 
2015
 
2014
 
 
(in millions)
Enable (a)
 
$
208

 
$
(1,633
)
 
$
303

SESH
 
—

 
—

 
5

  Total
 
$
208

 
$
(1,633
)
 
$
308


(a)
These amounts include impairment charges totaling $1,846 million composed of CERC’s impairment of its equity method investment in Enable of $1,225 million and CERC’s share, $621 million, of impairment charges Enable recorded for goodwill and long-lived assets for the year ended December 31, 2015. This impairment is offset by $213 million of earnings for the year ended December 31, 2015.
Revenue from External Customers by Products and Services [Table Text Block]
 
Year Ended December 31,
Revenues by Products and Services:
2016
 
2015
 
2014
 
(in millions)
Retail gas sales
$
3,329

 
$
3,725

 
$
5,049

Wholesale gas sales
977

 
657

 
1,159

Gas transportation and processing
23

 
26

 
38

Energy products and services
125

 
119

 
121

Total
$
4,454

 
$
4,527

 
$
6,367
Midstream Investments [Table Text Block]
Midstream Investments’ equity earnings (losses) are as follows:
 
 
Year Ended December 31,
 
 
2016
 
2015
 
2014
 
 
(in millions)
Enable (a)
 
$
208

 
$
(1,633
)
 
$
303

SESH
 
—

 
—

 
5

  Total
 
$
208

 
$
(1,633
)
 
$
308


(a)
These amounts include impairment charges totaling $1,846 million composed of CERC’s impairment of its equity method investment in Enable of $1,225 million and CERC’s share, $621 million, of impairment charges Enable recorded for goodwill and long-lived assets for the year ended December 31, 2015. This impairment is offset by $213 million of earnings for the year ended December 31, 2015.