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Revenue (Tables)
 6 Months Ended
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following tables represent a disaggregation of revenue from contracts with customers for the three and six months ended June 30, 2018, by type of service from each reportable segment:
 
 
For the Three Months Ended June 30, 2018
Revenues by Type of Service
 
Regulated Distribution
 
Regulated Transmission
 
Corporate/Other and Reconciling Adjustments (1)
 
Total
 
 
(In millions)
Distribution services(2)
 
$
1,228

 
$
—

 
$
(43
)
 
$
1,185

Retail generation
 
882

 
—

 
(14
)
 
868

Wholesale sales(2)
 
121

 
—

 
84

 
205

Transmission(2)
 
—

 
336

 
—

 
336

Other
 
35

 
—

 
—

 
35

Total revenues from contracts with customers
 
$
2,266

 
$
336

 
$
27

 
$
2,629

ARP
 
60

 
—

 
—

 
60

Other non-customer revenue
 
26

 
5

 
(16
)
 
15

Total revenues
 
$
2,352

 
$
341

 
$
11

 
$
2,704

(1) Includes eliminations and reconciling adjustments of inter-segment revenues.
(2) Includes $8 million in net reductions to revenue related to amounts subject to refund resulting from the Tax Act ($10 million subject to refund at Regulated Distribution, partially offset by $2 million subject to recovery at Regulated Transmission).

 
 
For the Six Months Ended June 30, 2018
Revenues by Type of Service
 
Regulated Distribution
 
Regulated Transmission
 
Corporate/Other and Reconciling Adjustments (1)
 
Total
 
 
(In millions)
Distribution services(2)
 
$
2,509

 
$
—

 
$
(55
)
 
$
2,454

Retail generation
 
1,922

 
—

 
(28
)
 
1,894

Wholesale sales(2)
 
244

 
—

 
204

 
448

Transmission(2)
 
—

 
655

 
—

 
655

Other
 
70

 
—

 
 
 
70

Total revenues from contracts with customers
 
$
4,745

 
$
655

 
$
121

 
$
5,521

ARP
 
124

 
—

 
—

 
124

Other non-customer revenue
 
59

 
9

 
(33
)
 
35

Total revenues
 
$
4,928

 
$
664

 
$
88

 
$
5,680

(1) Includes eliminations and reconciling adjustments of inter-segment revenues.
(2) Includes $84 million in reductions to revenue related to amounts subject to refund resulting from the Tax Act ($82 million at Regulated
Distribution and $2 million at Regulated Transmission).
The following table represents a disaggregation of the Regulated Distribution segment revenue from contracts with distribution service and retail generation customers for the three and six months ended June 30, 2018, by class:
 
 
For the Three Months Ended June 30, 2018
 
For the Six Months Ended June 30, 2018
Revenues by Customer Class
 
 
 
(In millions)
Residential
 
$
1,255

 
$
2,718

Commercial
 
570

 
1,150

Industrial
 
262

 
516

Other
 
23

 
47

Total Revenues
 
$
2,110

 
$
4,431

The following table represents a disaggregation of revenue from contracts with regulated transmission customers for the three and six months ended June 30, 2018, by transmission owner:
 
 
For the Three Months Ended June 30, 2018
 
For the Six Months Ended June 30, 2018
Revenues from Contracts with Customers by Transmission Asset Owner
 
 
 
(In millions)
ATSI
 
$
167

 
$
325

TrAIL
 
63

 
123

MAIT
 
34

 
64

Other
 
72

 
143

Total Revenues
 
$
336

 
$
655