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Revenue (Tables)
 12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following table represents a disaggregation of the Regulated Distribution segment revenue from contracts with distribution service and retail generation customers for the years ended December 31, 2019 and 2018, by class:
 
 
For the Years Ended December 31,
Revenues by Customer Class
 
2019
 
2018
 
 
(In millions)
Residential
 
$
5,412

 
$
5,598

Commercial
 
2,252

 
2,350

Industrial
 
1,106

 
1,056

Other
 
90

 
91

Total
 
$
8,860

 
$
9,095


The following tables represent a disaggregation of revenue from contracts with customers for the year ended December 31, 2019, by type of service from each reportable segment:
Revenues by Type of Service
 
Regulated Distribution
 
Regulated Transmission
 
Corporate/Other and Reconciling Adjustments (1)
 
Total
 
 
(In millions)
Distribution services(2)
 
$
5,133

 
$
—

 
$
(83
)
 
$
5,050

Retail generation
 
3,727

 
—

 
(57
)
 
3,670

Wholesale sales(2)
 
411

 
—

 
12

 
423

Transmission(2)
 
—

 
1,510

 
—

 
1,510

Other
 
150

 
—

 
2

 
152

Total revenues from contracts with customers
 
$
9,421

 
$
1,510

 
$
(126
)
 
$
10,805

ARP
 
181

 
—

 
—

 
181

Other non-customer revenue
 
96

 
16

 
(63
)
 
49

Total revenues
 
$
9,698

 
$
1,526

 
$
(189
)
 
$
11,035


(1) Includes eliminations and reconciling adjustments of inter-segment revenues.
(2) Includes reductions to revenue related to amounts subject to refund resulting from the Tax Act ($16 million at Regulated Distribution and $19 million at Regulated Transmission).

The following tables represent a disaggregation of revenue from contracts with customers for the year ended December 31, 2018, by type of service from each reportable segment:
Revenues by Type of Service
 
Regulated Distribution
 
Regulated Transmission
 
Corporate/Other and Reconciling Adjustments (1)
 
Total
 
 
(In millions)
Distribution services(2)
 
$
5,159

 
$
—

 
$
(104
)
 
$
5,055

Retail generation
 
3,936

 
—

 
(54
)
 
3,882

Wholesale sales(2)
 
502

 
—

 
22

 
524

Transmission(2)
 
—

 
1,335

 
—

 
1,335

Other
 
144

 
—

 
4

 
148

Total revenues from contracts with customers
 
$
9,741

 
$
1,335

 
$
(132
)
 
$
10,944

ARP
 
254

 
—

 
—

 
254

Other non-customer revenue
 
108

 
18

 
(63
)
 
63

Total revenues
 
$
10,103

 
$
1,353

 
$
(195
)
 
$
11,261


(1) Includes eliminations and reconciling adjustments of inter-segment revenues.
(2) Includes $147 million in net reductions to revenue related to amounts subject to refund resulting from the Tax Act ($131 million at Regulated Distribution and $16 million at Regulated Transmission).
The following table represents a disaggregation of revenue from contracts with regulated transmission customers by transmission owner for the years ended December 31, 2019 and 2018 by transmission owner:
 
 
For the Years Ended December 31,
Transmission Owner
 
2019
 
2018
 
 
(In millions)
ATSI
 
$
754

 
$
664

TrAIL
 
242

 
237

MAIT
 
224

 
150

Other
 
290

 
284

Total Revenues
 
$
1,510

 
$
1,335