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Revenue (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following table represents a disaggregation of revenue from contracts with regulated transmission customers for the year ended December 31, 2018, by transmission owner:
Revenues from Contracts with Customers by Transmission Asset Owner
 
 
(In millions)
ATSI
 
$
664

TrAIL
 
237

MAIT
 
150

Other
 
284

Total
 
$
1,335

The following table represents a disaggregation of the Regulated Distribution segment revenue from contracts with distribution service and retail generation customers for the year ended December 31, 2018, by class:
 
Revenues by Customer Class
 
 
 
 
(In millions)
 
Residential
 
$
5,598

 
Commercial
 
2,350

 
Industrial
 
1,056

 
Other
 
91

 
Total
 
$
9,095

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).