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Revenue Recognition (Tables)
 6 Months Ended
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue [Table Text Block]
The following tables disaggregate revenues by reportable business segment and major source:

CenterPoint Energy
 
 
Three Months Ended June 30,
 
 
2018
 
2017
 
 
Electric Transmission & Distribution (1)
 
Natural Gas Distribution (1)
 
Energy
 Services
 (2)
 
Other Operations (2)
 
Total
 
Electric Transmission & Distribution (1)
 
Natural Gas Distribution (1)
 
Energy
 Services
 (2)
 
Other Operations (2)
 
Total
 
 
(in millions)
Revenue from contracts
 
$
860

 
$
509

 
$
78

 
$
2

 
$
1,449

 
$
758

 
$
463

 
$
116

 
$
1

 
$
1,338

Derivatives income
 
—

 
—

 
782

 
—

 
782

 
—

 
—

 
815

 
—

 
815

Other (3)
 
(6
)
 
(14
)
 
—

 
2

 
(18
)
 
(6
)
 
14

 
—

 
2

 
10

Eliminations
 
—

 
(8
)
 
(19
)
 
—

 
(27
)
 
—

 
(7
)
 
(13
)
 
—

 
(20
)
Total revenues
 
$
854

 
$
487

 
$
841

 
$
4

 
$
2,186

 
$
752

 
$
470

 
$
918

 
$
3

 
$
2,143

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30,
 
 
2018
 
2017
 
 
Electric Transmission & Distribution (1)
 
Natural Gas Distribution (1)
 
Energy
 Services
 (2)
 
Other Operations (2)
 
Total
 
Electric Transmission & Distribution (1)
 
Natural Gas Distribution (1)
 
Energy
 Services
 (2)
 
Other Operations (2)
 
Total
 
 
(in millions)
Revenue from contracts
 
$
1,621

 
$
1,695

 
$
256

 
$
3

 
$
3,575

 
$
1,402

 
$
1,388

 
$
258

 
$
2

 
$
3,050

Derivatives income
 
(4
)
 
—

 
1,889

 
—

 
1,885

 
1

 
—

 
1,869

 
—

 
1,870

Other (3)
 
(12
)
 
(47
)
 
—

 
5

 
(54
)
 
(12
)
 
5

 
—

 
5

 
(2
)
Eliminations
 
—

 
(18
)
 
(47
)
 
—

 
(65
)
 
—

 
(16
)
 
(24
)
 
—

 
(40
)
Total revenues
 
$
1,605

 
$
1,630

 
$
2,098

 
$
8

 
$
5,341

 
$
1,391

 
$
1,377

 
$
2,103

 
$
7

 
$
4,878



Houston Electric
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
(in millions)
Revenue from contracts
 
$
860

 
$
758

 
$
1,621

 
$
1,402

Other (3)
 
(6
)
 
(6
)
 
(12
)
 
(12
)
 
 
$
854

 
$
752

 
$
1,609

 
$
1,390

CERC
 
 
Three Months Ended June 30,
 
 
2018
 
2017
 
 
Natural Gas Distribution (1)
 
Energy
 Services
 (2)
 
Other Operations (2)
 
Total
 
Natural Gas Distribution (1)
 
Energy
 Services
 (2)
 
Other Operations (2)
 
Total
 
 
(in millions)
Revenue from contracts
 
$
509

 
$
78

 
$
—

 
$
587

 
$
463

 
$
116

 
$
—

 
$
579

Derivatives income
 
—

 
782

 
—

 
782

 
—

 
815

 
—

 
815

Other (3)
 
(14
)
 
—

 
—

 
(14
)
 
14

 
—

 
(1
)
 
13

Eliminations
 
(8
)
 
(19
)
 
—

 
(27
)
 
(7
)
 
(13
)
 
—

 
(20
)
Total revenues
 
$
487

 
$
841

 
$
—

 
$
1,328

 
$
470

 
$
918

 
$
(1
)
 
$
1,387

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30,
 
 
2018
 
2017
 
 
Natural Gas Distribution (1)
 
Energy
 Services
 (2)
 
Other Operations (2)
 
Total
 
Natural Gas Distribution (1)
 
Energy
 Services
 (2)
 
Other Operations (2)
 
Total
 
 
(in millions)
Revenue from contracts
 
$
1,695

 
$
256

 
$
—

 
$
1,951

 
$
1,388

 
$
258

 
$
—

 
$
1,646

Derivatives income
 
—

 
1,889

 
—

 
1,889

 
—

 
1,869

 
—

 
1,869

Other (3)
 
(47
)
 
—

 
—

 
(47
)
 
5

 
—

 
—

 
5

Eliminations
 
(18
)
 
(47
)
 
—

 
(65
)
 
(16
)
 
(24
)
 
—

 
(40
)
Total revenues
 
$
1,630

 
$
2,098

 
$
—

 
$
3,728

 
$
1,377

 
$
2,103

 
$
—

 
$
3,480


(1)
Reflected in Utility revenues in the Condensed Statements of Consolidated Income.

(2)
Reflected in Non-utility revenues in the Condensed Statements of Consolidated Income.

(3)
Primarily consists of income from ARPs and leases. ARPs are contracts between the utility and its regulators, not between the utility and a customer. The Registrants recognize ARP revenue as other revenues when the regulator-specified conditions for recognition have been met. Upon recovery of ARP revenue through incorporation in rates charged for utility service to customers, ARP revenue is reversed and recorded as revenue from contracts with customers. The recognition of ARP revenues and the reversal of ARP revenues upon recovery through rates charged for utility service may not occur in the same period.