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Revenue (Tables) | 9 Months Ended
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Sep. 30, 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 three and nine months ended September 30, 2018, by transmission owner:
|  | For the Three Months Ended September 30, 2018 |  | For the Nine Months Ended September 30, 2018
Revenues from Contracts with Customers by Transmission Asset Owner |
|  | (In millions)
ATSI |  | $ | 167 |  |  | $ | 492 |
TrAIL |  | 60 |  |  | 183 |
MAIT |  | 43 |  |  | 106 |
Other |  | 71 |  |  | 215 |
Total Revenues |  | $ | 341 |  |  | $ | 996 |
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 nine months ended September 30, 2018, by class:
|  | For the Three Months Ended September 30, 2018 |  | For the Nine Months Ended September 30, 2018
Revenues by Customer Class |
|  | (In millions)
Residential |  | $ | 1,572 |  |  | $ | 4,290 |
Commercial |  | 628 |  |  | 1,778 |
Industrial |  | 276 |  |  | 792 |
Other |  | 23 |  |  | 70 |
Total Revenues |  | $ | 2,499 |  |  | $ | 6,930 |
The following tables represent a disaggregation of revenue from contracts with customers for the three and nine months ended September 30, 2018, by type of service from each reportable segment:
|  | For the Three Months Ended September 30, 2018
Revenues by Type of Service |  | Regulated Distribution |  | Regulated Transmission |  | Corporate/Other and Reconciling Adjustments (1) |  | Total
|  | (In millions)
Distribution services(2) |  | $ | 1,440 |  |  | $ | — |  |  | $ | (22 | ) |  | $ | 1,418 |
Retail generation |  | 1,059 |  |  | — |  |  | (14 | ) |  | 1,045 |
Wholesale sales(2) |  | 133 |  |  | — |  |  | 6 |  |  | 139 |
Transmission(2) |  | — |  |  | 341 |  |  | — |  |  | 341 |
Other |  | 43 |  |  | — |  |  | — |  |  | 43 |
Total revenues from contracts with customers |  | $ | 2,675 |  |  | $ | 341 |  |  | $ | (30 | ) |  | $ | 2,986 |
ARP |  | 66 |  |  | — |  |  | — |  |  | 66 |
Other non-customer revenue |  | 25 |  |  | 5 |  |  | (18 | ) |  | 12 |
Total revenues |  | $ | 2,766 |  |  | $ | 346 |  |  | $ | (48 | ) |  | $ | 3,064 |
(1) Includes eliminations and reconciling adjustments of inter-segment revenues. (2) Includes $29 million in net reductions to revenue related to amounts subject to refund resulting from the Tax Act ($27 million at Regulated Distribution and $2 million at Regulated Transmission).
|  | For the Nine Months Ended September 30, 2018
Revenues by Type of Service |  | Regulated Distribution |  | Regulated Transmission |  | Corporate/Other and Reconciling Adjustments(1) |  | Total
|  | (In millions)
Distribution services(2) |  | $ | 3,949 |  |  | $ | — |  |  | $ | (81 | ) |  | $ | 3,868 |
Retail generation |  | 2,981 |  |  | — |  |  | (42 | ) |  | 2,939 |
Wholesale sales(2) |  | 377 |  |  | — |  |  | 16 |  |  | 393 |
Transmission(2) |  | — |  |  | 996 |  |  | — |  |  | 996 |
Other |  | 113 |  |  | — |  |  | 4 |  |  | 117 |
Total revenues from contracts with customers |  | $ | 7,420 |  |  | $ | 996 |  |  | $ | (103 | ) |  | $ | 8,313 |
ARP |  | 190 |  |  | — |  |  | — |  |  | 190 |
Other non-customer revenue |  | 84 |  |  | 14 |  |  | (50 | ) |  | 48 |
Total revenues |  | $ | 7,694 |  |  | $ | 1,010 |  |  | $ | (153 | ) |  | $ | 8,551 |
(1) Includes eliminations and reconciling adjustments of inter-segment revenues. (2) Includes $113 million in reductions to revenue related to amounts subject to refund resulting from the Tax Act ($109 million at Regulated Distribution and $4 million at Regulated Transmission).

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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