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Revenue (Tables) | 3 Months Ended
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Mar. 31, 2019
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 months ended March 31, 2019 and 2018, by transmission owner:
|  | For the Three Months Ended March 31,
Revenues from Contracts with Customers by Transmission Asset Owner |  | 2019 |  | 2018
|  | (In millions)
ATSI |  | $ | 174 |  |  | $ | 158 |
TrAIL |  | 58 |  |  | 60 |
MAIT |  | 49 |  |  | 30 |
Other |  | 71 |  |  | 71 |
Total Revenues |  | $ | 352 |  |  | $ | 319 |
The following tables represent a disaggregation of revenue from contracts with customers for the three months ended March 31, 2019 and 2018 by type of service from each reportable segment:
|  | For the Three Months Ended March 31, 2019
Revenues by Type of Service |  | Regulated Distribution |  | Regulated Transmission |  | Corporate/Other and Reconciling Adjustments (1) |  | Total
|  | (In millions)
Distribution services(2) |  | $ | 1,286 |  |  | $ | — |  |  | $ | (21 | ) |  | $ | 1,265 |
Retail generation |  | 1,058 |  |  | — |  |  | (14 | ) |  | 1,044 |
Wholesale sales |  | 106 |  |  | — |  |  | 4 |  |  | 110 |
Transmission(2) |  | — |  |  | 352 |  |  | — |  |  | 352 |
Other |  | 34 |  |  | — |  |  | 1 |  |  | 35 |
Total revenues from contracts with customers |  | $ | 2,484 |  |  | $ | 352 |  |  | $ | (30 | ) |  | $ | 2,806 |
ARP |  | 62 |  |  | — |  |  | — |  |  | 62 |
Other non-customer revenue |  | 27 |  |  | 4 |  |  | (16 | ) |  | 15 |
Total revenues |  | $ | 2,573 |  |  | $ | 356 |  |  | $ | (46 | ) |  | $ | 2,883 |
(1) Includes eliminations and reconciling adjustments of inter-segment revenues. (2) Includes $32 million in reductions to revenue related to amounts subject to refund resulting from the Tax Act ($27 million at Regulated Distribution and $5 million at Regulated Transmission).
|  | For the Three Months Ended March 31, 2018
Revenues by Type of Service |  | Regulated Distribution |  | Regulated Transmission |  | Corporate/Other and Reconciling Adjustments (1) |  | Total
|  | (In millions)
Distribution services(2) |  | $ | 1,281 |  |  | $ | — |  |  | $ | (12 | ) |  | $ | 1,269 |
Retail generation |  | 1,040 |  |  | — |  |  | (14 | ) |  | 1,026 |
Wholesale sales |  | 123 |  |  | — |  |  | 5 |  |  | 128 |
Transmission(2) |  | — |  |  | 319 |  |  | — |  |  | 319 |
Other |  | 35 |  |  | — |  |  | 1 |  |  | 36 |
Total revenues from contracts with customers |  | $ | 2,479 |  |  | $ | 319 |  |  | $ | (20 | ) |  | $ | 2,778 |
ARP |  | 64 |  |  | — |  |  | — |  |  | 64 |
Other non-customer revenue |  | 33 |  |  | 4 |  |  | (17 | ) |  | 20 |
Total revenues |  | $ | 2,576 |  |  | $ | 323 |  |  | $ | (37 | ) |  | $ | 2,862 |
(1) Includes eliminations and reconciling adjustments of inter-segment revenues. (2) Includes $76 million in reductions to revenue related to amounts subject to refund resulting from the Tax Act ($72 million at Regulated Distribution and $4 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 months ended March 31, 2019 and 2018, by class:
|  | For the Three Months Ended March 31,
Revenues by Customer Class |  | 2019 |  | 2018
|  | (In millions)
Residential |  | $ | 1,484 |  |  | $ | 1,463 |
Commercial |  | 587 |  |  | 580 |
Industrial |  | 249 |  |  | 254 |
Other |  | 24 |  |  | 24 |
Total Revenues |  | $ | 2,344 |  |  | $ | 2,321 |

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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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