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Revenue Recognition (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue [Table Text Block]
The following tables disaggregate revenues by reportable segment and major source:
 
 
Year Ended December 31, 2018
 
 
CenterPoint Energy
 
Houston Electric
 
CERC
 
 
Electric Transmission & Distribution (1)
 
Natural Gas Distribution (1)
 
Energy
 Services
 (2)
 
Other Operations (2)
 
Total
 
Total
 
Natural Gas Distribution (1)
 
Energy
 Services
 (2)
 
Other Operations (2)
 
Total
 
 
(in millions)
Revenue from contracts
 
$
3,235

 
$
3,011

 
$
493

 
$
6

 
$
6,745

 
$
3,235

 
$
3,011

 
$
493

 
$
1

 
$
3,505

Derivatives income
 
(2
)
 
(2
)
 
4,028

 
—

 
4,024

 
—

 
(2
)
 
4,028

 
—

 
4,026

Other (3)
 
(1
)
 
(42
)
 
—

 
9

 
(34
)
 
(1
)
 
(42
)
 
—

 
—

 
(42
)
Eliminations
 
—

 
(36
)
 
(110
)
 
—

 
(146
)
 
—

 
(36
)
 
(110
)
 
—

 
(146
)
Total revenues
 
$
3,232

 
$
2,931

 
$
4,411

 
$
15

 
$
10,589

 
$
3,234

 
$
2,931

 
$
4,411

 
$
1

 
$
7,343

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Year Ended December 31, 2017
 
 
CenterPoint Energy
 
Houston Electric
 
CERC
 
 
Electric Transmission & Distribution (1)
 
Natural Gas Distribution (1)
 
Energy
 Services
 (2)
 
Other Operations (2)
 
Total
 
Total
 
Natural Gas Distribution (1)
 
Energy
 Services
 (2)
 
Other Operations (2)
 
Total
 
 
(in millions)
Revenue from contracts
 
$
3,001

 
$
2,638

 
$
480

 
$
5

 
$
6,124

 
$
3,001

 
$
2,638

 
$
480

 
$
—

 
$
3,118

Derivatives income
 
(1
)
 
—

 
3,569

 
—

 
3,568

 
—

 
—

 
3,569

 
—

 
3,569

Other (3)
 
(3
)
 
1

 
—

 
9

 
7

 
(3
)
 
1

 
—

 
—

 
1

Eliminations
 
—

 
(33
)
 
(52
)
 
—

 
(85
)
 
—

 
(33
)
 
(52
)
 
—

 
(85
)
Total revenues
 
$
2,997

 
$
2,606

 
$
3,997

 
$
14

 
$
9,614

 
$
2,998

 
$
2,606

 
$
3,997

 
$
—

 
$
6,603

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Year Ended December 31, 2016
 
 
CenterPoint Energy
 
Houston Electric
 
CERC
 
 
Electric Transmission & Distribution (1)
 
Natural Gas Distribution (1)
 
Energy
 Services
 (2)
 
Other Operations (2)
 
Total
 
Total
 
Natural Gas Distribution (1)
 
Energy
 Services
 (2)
 
Other Operations (2)
 
Total
 
 
(in millions)
Revenue from contracts
 
$
3,050

 
$
2,368

 
$
288

 
$
5

 
$
5,711

 
$
3,050

 
$
2,368

 
$
288

 
$
—

 
$
2,656

Derivatives income
 
1

 
—

 
1,811

 
—

 
1,812

 
—

 
—

 
1,811

 
—

 
1,811

Other (3)
 
9

 
41

 
—

 
10

 
60

 
9

 
41

 
—

 
1

 
42

Eliminations
 
—

 
(29
)
 
(26
)
 
—

 
(55
)
 
—

 
(29
)
 
(26
)
 
—

 
(55
)
Total revenues
 
$
3,060

 
$
2,380

 
$
2,073

 
$
15

 
$
7,528

 
$
3,059

 
$
2,380

 
$
2,073

 
$
1

 
$
4,454


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

(2)
Reflected in Non-utility revenues in the 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.