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Revenues Revenues (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue [Table Text Block] | Disaggregation of Revenues
|  | PSE&G |  | Power |  | Other |  | Eliminations |  | Consolidated |
|  | Millions |
| Three Months Ended June 30, 2018 |  |  |  |  |  |  |  |  |  |
| Revenues from Contracts with Customers |  |  |  |  |  |  |  |  |  |
| Electric Distribution | $ | 754 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 754 |  |
| Gas Distribution | 248 |  |  | — |  |  | — |  |  | (4 | ) |  | 244 |  |
| Transmission | 301 |  |  | — |  |  | — |  |  | — |  |  | 301 |  |
| Electricity and Related Product Sales |  |  |  |  |  |  |  |  |  |
| PJM |  |  |  |  |  |  |  |  |  |
| Third Party Sales | — |  |  | 373 |  |  | — |  |  | — |  |  | 373 |  |
| Sales to Affiliates | — |  |  | 147 |  |  | — |  |  | (147 | ) |  | — |  |
| New York ISO | — |  |  | 46 |  |  | — |  |  | — |  |  | 46 |  |
| ISO New England | — |  |  | 14 |  |  | — |  |  | — |  |  | 14 |  |
| Gas Sales |  |  |  |  |  |  |  |  |  |
| Third Party Sales | — |  |  | 30 |  |  | — |  |  | — |  |  | 30 |  |
| Sales to Affiliates | — |  |  | 108 |  |  | — |  |  | (108 | ) |  | — |  |
| Other Revenues from Contracts with Customers (A) | 63 |  |  | 13 |  |  | 125 |  |  | (1 | ) |  | 200 |  |
| Total Revenues from Contracts with Customers | 1,366 |  |  | 731 |  |  | 125 |  |  | (260 | ) |  | 1,962 |  |
| Revenues Unrelated to Contracts with Customers (B) | 20 |  |  | 36 |  |  | (2 | ) |  | — |  |  | 54 |  |
| Total Operating Revenues | $ | 1,386 |  |  | $ | 767 |  |  | $ | 123 |  |  | $ | (260 | ) |  | $ | 2,016 |  |
|  | PSE&G |  | Power |  | Other |  | Eliminations |  | Consolidated |
|  | Millions |
| Six Months Ended June 30, 2018 |  |  |  |  |  |  |  |  |  |
| Revenues from Contracts with Customers |  |  |  |  |  |  |  |  |  |
| Electric Distribution | $ | 1,444 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,444 |  |
| Gas Distribution | 1,007 |  |  | — |  |  | — |  |  | (7 | ) |  | 1,000 |  |
| Transmission | 613 |  |  | — |  |  | — |  |  | — |  |  | 613 |  |
| Electricity and Related Product Sales |  |  |  |  |  |  |  |  |  |
| PJM |  |  |  |  |  |  |  |  |  |
| Third Party Sales | — |  |  | 871 |  |  | — |  |  | — |  |  | 871 |  |
| Sales to Affiliates | — |  |  | 323 |  |  | — |  |  | (323 | ) |  | — |  |
| New York ISO | — |  |  | 105 |  |  | — |  |  | — |  |  | 105 |  |
| ISO New England | — |  |  | 61 |  |  | — |  |  | — |  |  | 61 |  |
| Gas Sales |  |  |  |  |  |  |  |  |  |
| Third Party Sales | — |  |  | 94 |  |  | — |  |  | — |  |  | 94 |  |
| Sales to Affiliates | — |  |  | 505 |  |  | — |  |  | (505 | ) |  | — |  |
| Other Revenues from Contracts with Customers (A) | 135 |  |  | 23 |  |  | 262 |  |  | (2 | ) |  | 418 |  |
| Total Revenues from Contracts with Customers | 3,199 |  |  | 1,982 |  |  | 262 |  |  | (837 | ) |  | 4,606 |  |
| Revenues Unrelated to Contracts with Customers (B) | 32 |  |  | 188 |  |  | 8 |  |  | — |  |  | 228 |  |
| Total Operating Revenues | $ | 3,231 |  |  | $ | 2,170 |  |  | $ | 270 |  |  | $ | (837 | ) |  | $ | 4,834 |  |
|  | PSE&G |  | Power |  | Other |  | Eliminations |  | Consolidated |
|  | Millions |
| Three Months Ended June 30, 2017 |  |  |  |  |  |  |  |  |  |
| Revenues from Contracts with Customers |  |  |  |  |  |  |  |  |  |
| Electric Distribution | $ | 757 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 757 |  |
| Gas Distribution | 233 |  |  | — |  |  | — |  |  | (6 | ) |  | 227 |  |
| Transmission | 307 |  |  | — |  |  | — |  |  | — |  |  | 307 |  |
| Electricity and Related Product Sales |  |  |  |  |  |  |  |  |  |
| PJM |  |  |  |  |  |  |  |  |  |
| Third Party Sales | — |  |  | 302 |  |  | — |  |  | — |  |  | 302 |  |
| Sales to Affiliates | — |  |  | 171 |  |  | — |  |  | (171 | ) |  | — |  |
| New York ISO | — |  |  | 50 |  |  | — |  |  | — |  |  | 50 |  |
| ISO New England | — |  |  | 9 |  |  | — |  |  | — |  |  | 9 |  |
| Gas Sales |  |  |  |  |  |  |  |  |  |
| Third Party Sales | — |  |  | 11 |  |  | — |  |  | — |  |  | 11 |  |
| Sales to Affiliates | — |  |  | 107 |  |  | — |  |  | (107 | ) |  | — |  |
| Other Revenues from Contracts with Customers (A) | 67 |  |  | 12 |  |  | 128 |  |  | (1 | ) |  | 206 |  |
| Total Revenues from Contracts with Customers | 1,364 |  |  | 662 |  |  | 128 |  |  | (285 | ) |  | 1,869 |  |
| Revenues Unrelated to Contracts with Customers (B) | 29 |  |  | 256 |  |  | (12 | ) |  | — |  |  | 273 |  |
| Total Operating Revenues | $ | 1,393 |  |  | $ | 918 |  |  | $ | 116 |  |  | $ | (285 | ) |  | $ | 2,142 |  |
|  | PSE&G |  | Power |  | Other |  | Eliminations |  | Consolidated |
|  | Millions |
| Six Months Ended June 30, 2017 |  |  |  |  |  |  |  |  |  |
| Revenues from Contracts with Customers |  |  |  |  |  |  |  |  |  |
| Electric Distribution | $ | 1,458 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,458 |  |
| Gas Distribution | 988 |  |  | — |  |  | — |  |  | (7 | ) |  | 981 |  |
| Transmission | 606 |  |  | — |  |  | — |  |  | — |  |  | 606 |  |
| Electricity and Related Product Sales |  |  |  |  |  |  |  |  |  |
| PJM |  |  |  |  |  |  |  |  |  |
| Third Party Sales | — |  |  | 616 |  |  | — |  |  | — |  |  | 616 |  |
| Sales to Affiliates | — |  |  | 355 |  |  | — |  |  | (355 | ) |  | — |  |
| New York ISO | — |  |  | 86 |  |  | — |  |  | — |  |  | 86 |  |
| ISO New England | — |  |  | 20 |  |  | — |  |  | — |  |  | 20 |  |
| Gas Sales |  |  |  |  |  |  |  |  |  |
| Third Party Sales | — |  |  | 63 |  |  | — |  |  | — |  |  | 63 |  |
| Sales to Affiliates | — |  |  | 508 |  |  | — |  |  | (508 | ) |  | — |  |
| Other Revenues from Contracts with Customers (A) | 129 |  |  | 22 |  |  | 256 |  |  | (2 | ) |  | 405 |  |
| Total Revenues from Contracts with Customers | 3,181 |  |  | 1,670 |  |  | 256 |  |  | (872 | ) |  | 4,235 |  |
| Revenues Unrelated to Contracts with Customers (B) | 38 |  |  | 517 |  |  | (57 | ) |  | — |  |  | 498 |  |
| Total Operating Revenues | $ | 3,219 |  |  | $ | 2,187 |  |  | $ | 199 |  |  | $ | (872 | ) |  | $ | 4,733 |  |
(A) | Includes primarily revenues from appliance repair services at PSE&G, solar power projects and energy management and fuel service contracts with LIPA at Power, and PSEG LI’s OSA with LIPA in Other.
(B) | Includes primarily alternative revenues at PSE&G, derivative contracts at Power, and lease contracts in Other. For the three and six months ended June 30, 2018, Other includes a $20 million loss and for the three and six months ended June 30, 2017, Other includes a $22 million loss and a $77 million loss, respectively, related to Energy Holdings’ investments in leases.
Revenue, Capacity Auction Obligations [Table Text Block] | Capacity Payments from the PJM Reliability Pricing Model (RPM) Annual Base Residual and Incremental Auctions—The Base Residual Auction is conducted annually three years in advance of the operating period. Power expects to realize the following average capacity prices for capacity obligations to be satisfied resulting from the base and incremental auctions which have been completed:
| Delivery Year |  | $ per MW-Day |  | MW Cleared |
| June 2018 to May 2019 |  | $205 |  | 9,200 |  |
| June 2019 to May 2020 |  | $116 |  | 8,900 |  |
| June 2020 to May 2021 |  | $174 |  | 7,800 |  |
| June 2021 to May 2022 |  | $178 |  | 7,700 |  |
Capacity Payments from the New England ISO Forward Capacity Market—The Forward Capacity Market Auction (FCM) is conducted annually three years in advance of the operating period. The table below includes Power’s cleared capacity in the FCM for the Bridgeport Harbor Station 5, which cleared the 2019/2020 auction at $231/MW-day for seven years, with escalations based on the Handy-Whitman Index and the planned retirement of Bridgeport Harbor Station 3 in 2021. Power expects to realize the following average capacity prices for capacity obligations to be satisfied resulting from the FCM auctions which have been completed:
| Delivery Year |  | $ per MW-Day |  | MW Cleared |
| June 2018 to May 2019 |  | $314 |  | 820 |  |
| June 2019 to May 2020 |  | $231 |  | 1,330 |  |
| June 2020 to May 2021 |  | $195 |  | 1,330 |  |
| June 2021 to May 2022 |  | $192 |  | 950 |  |
| June 2022 to May 2023 |  | $231 |  | 480 |  |
| June 2023 to May 2024 |  | $231 |  | 480 |  |
| June 2024 to May 2025 |  | $231 |  | 480 |  |
| June 2025 to May 2026 |  | $231 |  | 480 |  |

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