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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | 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 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 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 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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