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Segment Information (All Registrants) | 12 Months Ended
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Dec. 31, 2018
Segment Reporting [Abstract] |
Segment Information (All Registrants) | Segment Information (All Registrants) Operating segments for each of the Registrants are determined based on information used by the chief operating decision maker(s) (CODM) in deciding how to evaluate performance and allocate resources at each of the Registrants. Exelon has twelve reportable segments, which include Generation's six reportable segments consisting of the Mid-Atlantic, Midwest, New England, New York, ERCOT and all other power regions referred to collectively as “Other Power Regions” and ComEd, PECO, BGE, PHI's three reportable segments consisting of Pepco, DPL, and ACE. ComEd, PECO, BGE, Pepco, DPL and ACE each represent a single reportable segment, and as such, no separate segment information is provided for these Registrants. Exelon, ComEd, PECO, BGE, Pepco, DPL and ACE's CODMs evaluate the performance of and allocate resources to ComEd, PECO, BGE, Pepco, DPL and ACE based on net income. The basis for Generation's reportable segments is the integrated management of its electricity business that is located in different geographic regions, and largely representative of the footprints of ISO/RTO and/or NERC regions, which utilize multiple supply sources to provide electricity through various distribution channels (wholesale and retail). Generation's hedging strategies and risk metrics are also aligned to these same geographic regions. Descriptions of each of Generation’s six reportable segments are as follows:
• | Mid-Atlantic represents operations in the eastern half of PJM, which includes New Jersey, Maryland, Virginia, West Virginia, Delaware, the District of Columbia and parts of Pennsylvania and North Carolina.
• | Midwest represents operations in the western half of PJM and the United States footprint of MISO, excluding MISO’s Southern Region.
• | New England represents operations within ISO-NE.
• | New York represents operations within ISO-NY.
• | ERCOT represents operations within Electric Reliability Council of Texas.
• | Other Power Regions:
• | South represents operations in the FRCC, MISO’s Southern Region, the remaining portions of the SERC not included within MISO or PJM.
• | West represents operations in the WECC, including California ISO.
• | Canada represents operations across the entire country of Canada and includes AESO, OIESO and the Canadian portion of MISO.
The CODMs for Exelon and Generation evaluate the performance of Generation’s electric business activities and allocate resources based on RNF. Generation believes that RNF is a useful measurement of operational performance. RNF is not a presentation defined under GAAP and may not be comparable to other companies’ presentations or deemed more useful than the GAAP information provided elsewhere in this report. Generation’s operating revenues include all sales to third parties and affiliated sales to the Utility Registrants. Purchased power costs include all costs associated with the procurement and supply of electricity including capacity, energy and ancillary services. Fuel expense includes the fuel costs for Generation’s owned generation and fuel costs associated with tolling agreements. The results of Generation's other business activities are not regularly reviewed by the CODM and are therefore not classified as operating segments or included in the regional reportable segment amounts. These activities include natural gas, as well as other miscellaneous business activities that are not significant to Generation's overall operating revenues or results of operations. Further, Generation’s unrealized mark-to-market gains and losses on economic hedging activities and its amortization of certain intangible assets and liabilities relating to commodity contracts recorded at fair value from mergers and acquisitions are also excluded from the regional reportable segment amounts. Exelon and Generation do not use a measure of total assets in making decisions regarding allocating resources to or assessing the performance of these reportable segments. During the first quarter of 2019, due to a change in economics in our New England region, Generation is changing the way that information is reviewed by the CODM. The New England region will no longer be regularly reviewed as a separate region by the CODM nor will it be presented separately in any external information presented to third parties. Information for the New England region will be reviewed by the CODM as part of Other Power Regions. As a result, beginning in the first quarter of 2019, Generation will disclose five reportable segments consisting of Mid-Atlantic, Midwest, New York, ERCOT and Other Power Regions. Beginning in the first quarter of 2019, Other Power Regions will include:
• | South represents operations in the FRCC, MISO’s Southern Region, the remaining portions of the SERC not included within MISO or PJM.
• | West represents operations in the WECC, including California ISO.
• | Canada represents operations across the entire country of Canada and includes AESO, OIESO and the Canadian portion of MISO.
• | New England represents operations within ISO-NE.
An analysis and reconciliation of the Registrants’ reportable segment information to the respective information in the consolidated financial statements for the years ended December 31, 2018, 2017, and 2016 is as follows:
|  |  |  |  |  |  |  |  | Successor |  |  |  |  |  |
| Generation (a) |  | ComEd |  | PECO |  | BGE |  | PHI (e) |  | Other (b) |  | Intersegment Eliminations |  | Exelon
Operating revenues(c): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Competitive businesses electric revenues | $ | 17,411 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (1,256 | ) |  | $ | 16,155 |
Competitive businesses natural gas revenues | 2,718 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (8 | ) |  | 2,710 |
Competitive businesses other revenues | 308 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (5 | ) |  | 303 |
Rate-regulated electric revenues | — |  |  | 5,882 |  |  | 2,470 |  |  | 2,428 |  |  | 4,609 |  |  | — |  |  | (45 | ) |  | 15,344 |
Rate-regulated natural gas revenues | — |  |  | — |  |  | 568 |  |  | 741 |  |  | 181 |  |  | — |  |  | (20 | ) |  | 1,470 |
Shared service and other revenues | — |  |  | — |  |  | — |  |  | — |  |  | 15 |  |  | 1,948 |  |  | (1,960 | ) |  | 3 |
Total operating revenues | $ | 20,437 |  |  | $ | 5,882 |  |  | $ | 3,038 |  |  | $ | 3,169 |  |  | $ | 4,805 |  |  | $ | 1,948 |  |  | $ | (3,294 | ) |  | $ | 35,985 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Competitive businesses electric revenues | $ | 15,332 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (1,105 | ) |  | $ | 14,227 |
Competitive businesses natural gas revenues | 2,575 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,575 |
Competitive businesses other revenues | 593 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1 | ) |  | 592 |
Rate-regulated electric revenues | — |  |  | 5,536 |  |  | 2,375 |  |  | 2,489 |  |  | 4,469 |  |  | — |  |  | (29 | ) |  | 14,840 |
Rate-regulated natural gas revenues | — |  |  | — |  |  | 495 |  |  | 687 |  |  | 161 |  |  | — |  |  | (10 | ) |  | 1,333 |
Shared service and other revenues | — |  |  | — |  |  | — |  |  | — |  |  | 49 |  |  | 1,831 |  |  | (1,880 | ) |  | — |
Total operating revenues | $ | 18,500 |  |  | $ | 5,536 |  |  | $ | 2,870 |  |  | $ | 3,176 |  |  | $ | 4,679 |  |  | $ | 1,831 |  |  | $ | (3,025 | ) |  | $ | 33,567 |
|  |  |  |  |  |  |  |  | Successor |  |  |  |  |  |
| Generation (a) |  | ComEd |  | PECO |  | BGE |  | PHI (e) |  | Other (b) |  | Intersegment Eliminations |  | Exelon
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Competitive businesses electric revenues | $ | 15,400 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (1,430 | ) |  | $ | 13,970 |
Competitive businesses natural gas revenues | 2,146 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,146 |
Competitive businesses other revenues | 211 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (4 | ) |  | 207 |
Rate-regulated electric revenues | — |  |  | 5,254 |  |  | 2,531 |  |  | 2,609 |  |  | 3,506 |  |  | — |  |  | (31 | ) |  | 13,869 |
Rate-regulated natural gas revenues | — |  |  | — |  |  | 463 |  |  | 624 |  |  | 92 |  |  | — |  |  | (13 | ) |  | 1,166 |
Shared service and other revenues | — |  |  | — |  |  | — |  |  | — |  |  | 45 |  |  | 1,648 |  |  | (1,686 | ) |  | 7 |
Total operating revenues | $ | 17,757 |  |  | $ | 5,254 |  |  | $ | 2,994 |  |  | $ | 3,233 |  |  | $ | 3,643 |  |  | $ | 1,648 |  |  | $ | (3,164 | ) |  | $ | 31,365 |
Intersegment revenues(d): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | $ | 1,269 |  |  | $ | 27 |  |  | $ | 8 |  |  | $ | 29 |  |  | $ | 15 |  |  | $ | 1,942 |  |  | $ | (3,289 | ) |  | $ | 1 |
2017 | 1,110 |  |  | 15 |  |  | 7 |  |  | 16 |  |  | 50 |  |  | 1,824 |  |  | (3,020 | ) |  | 2 |
2016 | 1,428 |  |  | 15 |  |  | 8 |  |  | 21 |  |  | 45 |  |  | 1,647 |  |  | (3,159 | ) |  | 5 |
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | $ | 1,797 |  |  | $ | 940 |  |  | $ | 301 |  |  | $ | 483 |  |  | $ | 740 |  |  | $ | 92 |  |  | $ | — |  |  | $ | 4,353 |
2017 | 1,457 |  |  | 850 |  |  | 286 |  |  | 473 |  |  | 675 |  |  | 87 |  |  | — |  |  | 3,828 |
2016 | 1,879 |  |  | 775 |  |  | 270 |  |  | 423 |  |  | 515 |  |  | 74 |  |  | — |  |  | 3,936 |
Operating expenses (c): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | $ | 19,510 |  |  | $ | 4,741 |  |  | $ | 2,452 |  |  | $ | 2,696 |  |  | $ | 4,156 |  |  | $ | 1,929 |  |  | $ | (3,341 | ) |  | $ | 32,143 |
2017 | 18,001 |  |  | 4,214 |  |  | 2,215 |  |  | 2,562 |  |  | 3,911 |  |  | 1,742 |  |  | (3,026 | ) |  | 29,619 |
2016 | 16,878 |  |  | 4,056 |  |  | 2,292 |  |  | 2,683 |  |  | 3,549 |  |  | 1,812 |  |  | (3,164 | ) |  | 28,106 |
Interest expense, net: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | $ | 432 |  |  | $ | 347 |  |  | $ | 129 |  |  | $ | 106 |  |  | $ | 261 |  |  | $ | 279 |  |  | $ | — |  |  | $ | 1,554 |
2017 | 440 |  |  | 361 |  |  | 126 |  |  | 105 |  |  | 245 |  |  | 283 |  |  | — |  |  | 1,560 |
2016 | 364 |  |  | 461 |  |  | 123 |  |  | 103 |  |  | 195 |  |  | 290 |  |  | — |  |  | 1,536 |
Income (loss) before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | $ | 365 |  |  | $ | 832 |  |  | $ | 466 |  |  | $ | 387 |  |  | $ | 432 |  |  | $ | (249 | ) |  | $ | (1 | ) |  | $ | 2,232 |
2017 | 1,455 |  |  | 984 |  |  | 538 |  |  | 525 |  |  | 578 |  |  | (296 | ) |  | (2 | ) |  | 3,782 |
2016 | 857 |  |  | 679 |  |  | 587 |  |  | 468 |  |  | (58 | ) |  | (555 | ) |  | (5 | ) |  | 1,973 |
Income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | $ | (108 | ) |  | $ | 168 |  |  | $ | 6 |  |  | $ | 74 |  |  | $ | 35 |  |  | $ | (55 | ) |  | $ | — |  |  | $ | 120 |
2017 | (1,376 | ) |  | 417 |  |  | 104 |  |  | 218 |  |  | 217 |  |  | 294 |  |  | — |  |  | (126 | )
2016 | 282 |  |  | 301 |  |  | 149 |  |  | 174 |  |  | 3 |  |  | (156 | ) |  | — |  |  | 753 |
|  |  |  |  |  |  |  |  | Successor |  |  |  |  |  |
| Generation (a) |  | ComEd |  | PECO |  | BGE |  | PHI (e) |  | Other (b) |  | Intersegment Eliminations |  | Exelon
Net income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | $ | 443 |  |  | $ | 664 |  |  | $ | 460 |  |  | $ | 313 |  |  | $ | 398 |  |  | $ | (193 | ) |  | $ | (1 | ) |  | $ | 2,084 |
2017 | 2,798 |  |  | 567 |  |  | 434 |  |  | 307 |  |  | 362 |  |  | (590 | ) |  | (2 | ) |  | 3,876 |
2016 | 550 |  |  | 378 |  |  | 438 |  |  | 294 |  |  | (61 | ) |  | (398 | ) |  | (5 | ) |  | 1,196 |
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | $ | 2,242 |  |  | $ | 2,126 |  |  | $ | 849 |  |  | $ | 959 |  |  | $ | 1,375 |  |  | $ | 43 |  |  | $ | — |  |  | $ | 7,594 |
2017 | $ | 2,259 |  |  | $ | 2,250 |  |  | $ | 732 |  |  | $ | 882 |  |  | $ | 1,396 |  |  | $ | 65 |  |  | $ | — |  |  | $ | 7,584 |
2016 | $ | 3,078 |  |  | $ | 2,734 |  |  | $ | 686 |  |  | $ | 934 |  |  | $ | 1,008 |  |  | $ | 113 |  |  | $ | — |  |  | $ | 8,553 |
Total assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | $ | 47,556 |  |  | $ | 31,213 |  |  | $ | 10,642 |  |  | $ | 9,716 |  |  | $ | 21,984 |  |  | $ | 8,355 |  |  | $ | (9,800 | ) |  | $ | 119,666 |
2017 | 48,457 |  |  | 29,726 |  |  | 10,170 |  |  | 9,104 |  |  | 21,247 |  |  | 8,618 |  |  | (10,552 | ) |  | 116,770 |
__________
(a) | See Note 25 — Related Party Transactions for additional information on intersegment revenues.
(b) | Other primarily includes Exelon’s corporate operations, shared service entities and other financing and investment activities.
(c) | Includes gross utility tax receipts from customers. The offsetting remittance of utility taxes to the governing bodies is recorded in expenses in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. See Note 23 — Supplemental Financial Information for additional information on total utility taxes.
(d) | Intersegment revenues exclude sales to unconsolidated affiliates. The intersegment profit associated with Generation’s sale of certain products and services by and between Exelon’s segments is not eliminated in consolidation due to the recognition of intersegment profit in accordance with regulatory authoritative guidance. For Exelon, these amounts are included in Operating revenues in the Consolidated Statements of Operations and Comprehensive Income.
(e) | Amounts included represent activity for PHI's successor period, March 24, 2016 through December 31, 2018.
Successor and Predecessor PHI:
| Pepco |  | DPL |  | ACE |  | Other(b) |  | Intersegment Eliminations |  | PHI
Operating revenues(a): |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 - Successor |  |  |  |  |  |  |  |  |  |  |
Rate-regulated electric revenues | $ | 2,239 |  |  | $ | 1,151 |  |  | $ | 1,236 |  |  | $ | — |  |  | $ | (17 | ) |  | $ | 4,609 |
Rate-regulated natural gas revenues | — |  |  | 181 |  |  | — |  |  | — |  |  | — |  |  | 181 |
Shared service and other revenues | — |  |  | — |  |  | — |  |  | 435 |  |  | (420 | ) |  | 15 |
Total operating revenues | $ | 2,239 |  |  | $ | 1,332 |  |  | $ | 1,236 |  |  | $ | 435 |  |  | $ | (437 | ) |  | $ | 4,805 |
December 31, 2017 - Successor |  |  |  |  |  |  |  |  |  |  |
Rate-regulated electric revenues | $ | 2,158 |  |  | $ | 1,139 |  |  | $ | 1,186 |  |  | $ | — |  |  | $ | (14 | ) |  | $ | 4,469 |
Rate-regulated natural gas revenues | — |  |  | 161 |  |  | — |  |  | — |  |  | — |  |  | 161 |
Shared service and other revenues | — |  |  | — |  |  | — |  |  | 52 |  |  | (3 | ) |  | 49 |
Total operating revenues | $ | 2,158 |  |  | $ | 1,300 |  |  | $ | 1,186 |  |  | $ | 52 |  |  | $ | (17 | ) |  | $ | 4,679 |
March 24, 2016 to December 31, 2016 - Successor |  |  |  |  |  |  |  |  |  |  |
Rate-regulated electric revenues | $ | 1,675 |  |  | $ | 850 |  |  | $ | 989 |  |  | $ | 5 |  |  | $ | (13 | ) |  | $ | 3,506 |
Rate-regulated natural gas revenues | — |  |  | 92 |  |  | — |  |  | — |  |  | — |  |  | 92 |
Shared service and other revenues | — |  |  | — |  |  | — |  |  | 45 |  |  | — |  |  | 45 |
Total operating revenues | $ | 1,675 |  |  | $ | 942 |  |  | $ | 989 |  |  | $ | 50 |  |  | $ | (13 | ) |  | $ | 3,643 |
January 1, 2016 to March 23, 2016 - Predecessor |  |  |  |  |  |  |  |  |  |  |
Rate-regulated electric revenues | $ | 511 |  |  | $ | 279 |  |  | $ | 268 |  |  | $ | 42 |  |  | $ | (4 | ) |  | $ | 1,096 |
Rate-regulated natural gas revenues | — |  |  | 56 |  |  | — |  |  | 1 |  |  | — |  |  | 57 |
Shared service and other revenues | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total operating revenues | $ | 511 |  |  | $ | 335 |  |  | $ | 268 |  |  | $ | 43 |  |  | $ | (4 | ) |  | $ | 1,153 |
Intersegment revenues: |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 - Successor | $ | 6 |  |  | $ | 8 |  |  | $ | 3 |  |  | $ | 435 |  |  | $ | (437 | ) |  | $ | 15 |
December 31, 2017 - Successor | 6 |  |  | 8 |  |  | 2 |  |  | 53 |  |  | (19 | ) |  | 50 |
March 24, 2016 to December 31, 2016 - Successor | 4 |  |  | 5 |  |  | 2 |  |  | 47 |  |  | (13 | ) |  | 45 |
January 1, 2016 to March 23, 2016 - Predecessor | 1 |  |  | 2 |  |  | 1 |  |  | — |  |  | (4 | ) |  | — |
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 - Successor | $ | 385 |  |  | $ | 182 |  |  | $ | 136 |  |  | $ | 37 |  |  | $ | — |  |  | $ | 740 |
December 31, 2017 - Successor | 321 |  |  | 167 |  |  | 146 |  |  | 42 |  |  | (1 | ) |  | $ | 675 |
March 24, 2016 to December 31, 2016 - Successor | 224 |  |  | 120 |  |  | 128 |  |  | 43 |  |  | — |  |  | $ | 515 |
January 1, 2016 to March 23, 2016 - Predecessor | 71 |  |  | 37 |  |  | 37 |  |  | 11 |  |  | (4 | ) |  | $ | 152 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 - Successor | $ | 1,919 |  |  | $ | 1,143 |  |  | $ | 1,087 |  |  | $ | 442 |  |  | $ | (435 | ) |  | $ | 4,156 |
December 31, 2017 - Successor | 1,760 |  |  | 1,071 |  |  | 1,029 |  |  | 68 |  |  | (17 | ) |  | $ | 3,911 |
March 24, 2016 to December 31, 2016 - Successor | 1,577 |  |  | 952 |  |  | 1,000 |  |  | 33 |  |  | (13 | ) |  | $ | 3,549 |
January 1, 2016 to March 23, 2016 - Predecessor | 443 |  |  | 284 |  |  | 251 |  |  | 73 |  |  | (3 | ) |  | $ | 1,048 |
| Pepco |  | DPL |  | ACE |  | Other(b) |  | Intersegment Eliminations |  | PHI
Interest expense, net: |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 - Successor | $ | 128 |  |  | $ | 58 |  |  | $ | 64 |  |  | $ | 11 |  |  | $ | — |  |  | $ | 261 |
December 31, 2017 - Successor | 121 |  |  | 51 |  |  | 61 |  |  | 13 |  |  | (1 | ) |  | $ | 245 |
March 24, 2016 to December 31, 2016 - Successor | 98 |  |  | 38 |  |  | 47 |  |  | 12 |  |  | — |  |  | $ | 195 |
January 1, 2016 to March 23, 2016 - Predecessor | 29 |  |  | 12 |  |  | 15 |  |  | 11 |  |  | (2 | ) |  | $ | 65 |
Income (loss) before income taxes: |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 - Successor | $ | 223 |  |  | $ | 142 |  |  | $ | 87 |  |  | $ | 388 |  |  | $ | (408 | ) |  | $ | 432 |
December 31, 2017 - Successor | 310 |  |  | 192 |  |  | 103 |  |  | 377 |  |  | (404 | ) |  | $ | 578 |
March 24, 2016 to December 31, 2016 - Successor | 36 |  |  | (30 | ) |  | (51 | ) |  | (84 | ) |  | 71 |  |  | $ | (58 | )
January 1, 2016 to March 23, 2016 - Predecessor | 47 |  |  | 43 |  |  | 5 |  |  | 59 |  |  | (118 | ) |  | $ | 36 |
Income taxes: |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 - Successor | $ | 13 |  |  | $ | 22 |  |  | $ | 12 |  |  | $ | (10 | ) |  | $ | (2 | ) |  | $ | 35 |
December 31, 2017 - Successor | 105 |  |  | 71 |  |  | 26 |  |  | 15 |  |  | — |  |  | $ | 217 |
March 24, 2016 to December 31, 2016 - Successor | 26 |  |  | 5 |  |  | (5 | ) |  | (23 | ) |  | — |  |  | $ | 3 |
January 1, 2016 to March 23, 2016 - Predecessor | 15 |  |  | 17 |  |  | 1 |  |  | (16 | ) |  | — |  |  | $ | 17 |
Net income (loss): |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 - Successor | $ | 210 |  |  | $ | 120 |  |  | $ | 75 |  |  | $ | (22 | ) |  | $ | 15 |  |  | $ | 398 |
December 31, 2017 - Successor | 205 |  |  | 121 |  |  | 77 |  |  | (91 | ) |  | 50 |  |  | $ | 362 |
March 24, 2016 to December 31, 2016 - Successor | 10 |  |  | (35 | ) |  | (47 | ) |  | (34 | ) |  | 45 |  |  | $ | (61 | )
January 1, 2016 to March 23, 2016 - Predecessor | 32 |  |  | 26 |  |  | 5 |  |  | (44 | ) |  | — |  |  | $ | 19 |
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 - Successor | $ | 656 |  |  | $ | 364 |  |  | $ | 335 |  |  | $ | 20 |  |  | $ | — |  |  | $ | 1,375 |
December 31, 2017 - Successor | 628 |  |  | 428 |  |  | 312 |  |  | 28 |  |  | — |  |  | $ | 1,396 |
March 24, 2016 to December 31, 2016 - Successor | 489 |  |  | 277 |  |  | 218 |  |  | 24 |  |  | — |  |  | 1,008 |
January 1, 2016 to March 23, 2016 - Predecessor | 97 |  |  | 72 |  |  | 93 |  |  | 11 |  |  | — |  |  | 273 |
Total assets: |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 - Successor | $ | 8,299 |  |  | $ | 4,588 |  |  | $ | 3,699 |  |  | $ | 10,819 |  |  | $ | (5,421 | ) |  | $ | 21,984 |
December 31, 2017 - Successor | 7,832 |  |  | 4,357 |  |  | 3,445 |  |  | 10,600 |  |  | (4,987 | ) |  | 21,247 |
__________
(a) | Includes gross utility tax receipts from customers. The offsetting remittance of utility taxes to the governing bodies is recorded in expenses in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. See Note 23 — Supplemental Financial Information for additional information on total utility taxes.
(b) | Other primarily includes PHI’s corporate operations, shared service entities and other financing and investment activities. For the predecessor periods presented, Other includes the activity of PHI’s unregulated businesses which were distributed to Exelon and Generation as a result of the PHI Merger.
The following tables disaggregate the Registrants' revenue recognized from contracts with customers into categories that depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. For Generation, the disaggregation of revenues reflects Generation's two primary products of power sales and natural gas sales, with further disaggregation of power sales provided by geographic region. For the Utility Registrants, the disaggregation of revenues reflects the two primary utility services of rate-regulated electric sales and rate-regulated natural gas sales (where applicable), with further disaggregation of these tariff sales provided by major customer groups. Exelon's disaggregated revenues are consistent with Generation and the Utility Registrants but exclude any intercompany revenues. Competitive Business Revenues (Generation):
| 2018
| Revenues from external customers(a) |  |  |  |
| Contracts with customers |  | Other(b) |  | Total |  | Intersegment Revenues |  | Total Revenues
Mid-Atlantic | $ | 5,241 |  |  | $ | 233 |  |  | $ | 5,474 |  |  | $ | 13 |  |  | $ | 5,487 |
Midwest | 4,527 |  |  | 190 |  |  | 4,717 |  |  | (11 | ) |  | 4,706 |
New England | 2,660 |  |  | 185 |  |  | 2,845 |  |  | (4 | ) |  | 2,841 |
New York | 1,723 |  |  | (36 | ) |  | 1,687 |  |  | — |  |  | 1,687 |
ERCOT | 572 |  |  | 560 |  |  | 1,132 |  |  | 1 |  |  | 1,133 |
Other Power Regions | 870 |  |  | 686 |  |  | 1,556 |  |  | (62 | ) |  | 1,494 |
Total Competitive Businesses Electric Revenues | 15,593 |  |  | 1,818 |  |  | 17,411 |  |  | (63 | ) |  | 17,348 |
Competitive Businesses Natural Gas Revenues | 1,524 |  |  | 1,194 |  |  | 2,718 |  |  | 62 |  |  | 2,780 |
Competitive Businesses Other Revenues(c) | 510 |  |  | (202 | ) |  | 308 |  |  | 1 |  |  | 309 |
Total Generation Consolidated Operating Revenues | 17,627 |  |  | 2,810 |  |  | $ | 20,437 |  |  | $ | — |  |  | $ | 20,437 |
| 2017
| Revenues from external customers(a) |  |  |  |
| Contracts with customers |  | Other(b) |  | Total |  | Intersegment Revenues |  | Total Revenues
Mid-Atlantic | $ | 5,523 |  |  | $ | (8 | ) |  | $ | 5,515 |  |  | $ | 25 |  |  | $ | 5,540 |
Midwest | 3,923 |  |  | 283 |  |  | 4,206 |  |  | (25 | ) |  | 4,181 |
New England | 2,064 |  |  | (54 | ) |  | 2,010 |  |  | (8 | ) |  | 2,002 |
New York | 1,605 |  |  | (38 | ) |  | 1,567 |  |  | (17 | ) |  | 1,550 |
ERCOT | 641 |  |  | 317 |  |  | 958 |  |  | 4 |  |  | 962 |
Other Power Regions | 594 |  |  | 482 |  |  | 1,076 |  |  | (27 | ) |  | 1,049 |
Total Competitive Businesses Electric Revenues | 14,350 |  |  | 982 |  |  | 15,332 |  |  | (48 | ) |  | 15,284 |
Competitive Businesses Natural Gas Revenues | 1,658 |  |  | 917 |  |  | 2,575 |  |  | 53 |  |  | 2,628 |
Competitive Businesses Other Revenues(c) | 744 |  |  | (151 | ) |  | 593 |  |  | (5 | ) |  | 588 |
Total Generation Consolidated Operating Revenues | $ | 16,752 |  |  | $ | 1,748 |  |  | $ | 18,500 |  |  | $ | — |  |  | $ | 18,500 |
| 2016
| Revenues from external customers(a) |  |  |  |
| Contracts with customers |  | Other(b) |  | Total |  | Intersegment Revenues |  | Total Revenues
Mid-Atlantic | $ | 6,182 |  |  | $ | 30 |  |  | $ | 6,212 |  |  | $ | (33 | ) |  | $ | 6,179 |
Midwest | 4,007 |  |  | 395 |  |  | 4,402 |  |  | 10 |  |  | 4,412 |
New England | 1,953 |  |  | (175 | ) |  | 1,778 |  |  | (9 | ) |  | 1,769 |
New York | 1,198 |  |  | 10 |  |  | 1,208 |  |  | (42 | ) |  | 1,166 |
ERCOT | 810 |  |  | 21 |  |  | 831 |  |  | 6 |  |  | 837 |
Other Power Regions | 670 |  |  | 299 |  |  | 969 |  |  | (62 | ) |  | 907 |
Total Competitive Businesses Electric Revenues | 14,820 |  |  | 580 |  |  | 15,400 |  |  | (130 | ) |  | 15,270 |
Competitive Businesses Natural Gas Revenues | 1,953 |  |  | 193 |  |  | 2,146 |  |  | 135 |  |  | 2,281 |
Competitive Businesses Other Revenues(c) | 756 |  |  | (545 | ) |  | 211 |  |  | (5 | ) |  | 206 |
Total Generation Consolidated Operating Revenues | $ | 17,529 |  |  | $ | 228 |  |  | $ | 17,757 |  |  | $ | — |  |  | $ | 17,757 |
__________
(a) | Includes all wholesale and retail electric sales to third parties and affiliated sales to the Utility Registrants.
(b) | Includes revenues from derivatives and leases.
(c) | Other represents activities not allocated to a region. See text above for a description of included activities. Includes a $38 million and $52 million decrease to revenues for the amortization of intangible assets and liabilities related to commodity contracts recorded at fair value in 2017 and 2016, respectively, unrealized mark-to-market losses of $262 million, $131 million, and $500 million in 2018, 2017, and 2016, respectively, and elimination of intersegment revenues.
Revenues net of purchased power and fuel expense (Generation):
| 2018 |  | 2017 |  | 2016
| RNF from external customers(a) |  | Intersegment RNF |  | Total RNF |  | RNF from external customers(a) |  | Intersegment RNF |  | Total RNF |  | RNF from external customers(a) |  | Intersegment RNF |  | Total RNF
Mid-Atlantic | $ | 3,022 |  |  | $ | 51 |  |  | $ | 3,073 |  |  | $ | 3,105 |  |  | $ | 109 |  |  | $ | 3,214 |  |  | $ | 3,282 |  |  | $ | 35 |  |  | $ | 3,317 |
Midwest | 3,112 |  |  | 23 |  |  | 3,135 |  |  | 2,810 |  |  | 10 |  |  | 2,820 |  |  | 2,969 |  |  | 2 |  |  | 2,971 |
New England | 368 |  |  | (14 | ) |  | 354 |  |  | 538 |  |  | (24 | ) |  | 514 |  |  | 467 |  |  | (29 | ) |  | 438 |
New York | 1,112 |  |  | 10 |  |  | 1,122 |  |  | 1,007 |  |  | 1 |  |  | 1,008 |  |  | 771 |  |  | (19 | ) |  | 752 |
ERCOT | 501 |  |  | (243 | ) |  | 258 |  |  | 575 |  |  | (243 | ) |  | 332 |  |  | 412 |  |  | (131 | ) |  | 281 |
Other Power Regions | 515 |  |  | (140 | ) |  | 375 |  |  | 476 |  |  | (171 | ) |  | 305 |  |  | 483 |  |  | (147 | ) |  | 336 |
Total Revenues net of purchased power and fuel for Reportable Segments | $ | 8,630 |  |  | $ | (313 | ) |  | $ | 8,317 |  |  | $ | 8,511 |  |  | $ | (318 | ) |  | $ | 8,193 |  |  | $ | 8,384 |  |  | $ | (289 | ) |  | $ | 8,095 |
Other (b) | 114 |  |  | 313 |  |  | 427 |  |  | 299 |  |  | 318 |  |  | 617 |  |  | 543 |  |  | 289 |  |  | 832 |
Total Generation Revenues net of purchased power and fuel expense | $ | 8,744 |  |  | $ | — |  |  | $ | 8,744 |  |  | $ | 8,810 |  |  | $ | — |  |  | $ | 8,810 |  |  | $ | 8,927 |  |  | $ | — |  |  | $ | 8,927 |
__________
(a) | Includes purchases and sales from/to third parties and affiliated sales to the Utility Registrants.
(b) | Other represents activities not allocated to a region. See text above for a description of included activities. Includes a $54 million and $57 million decrease in RNF for the amortization of intangible assets and liabilities related to commodity contracts in 2017 and 2016, respectively, unrealized mark-to-market losses of $319 million, $175 million, and $41 million in 2018, 2017, and 2016, respectively, accelerated nuclear fuel amortization associated with the announced early plant retirements as discussed in Note 8 - Early Plant Retirements of $57 million, $12 million and $60 million for the year ended December 31, 2018, 2017, and 2016 and the elimination of intersegment RNF.
Electric and Gas Revenue by Customer Class (Utility Registrants):
| 2018
|  |  |  |  |  |  | Successor |  |  |  |  |  |
Revenues from contracts with customers | ComEd |  | PECO |  | BGE |  | PHI |  | Pepco |  | DPL |  | ACE
Rate-regulated electric revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | $ | 2,942 |  |  | $ | 1,566 |  |  | $ | 1,382 |  |  | $ | 2,351 |  |  | $ | 1,021 |  |  | $ | 669 |  |  | $ | 661 |
Small commercial & industrial | 1,487 |  |  | 404 |  |  | 257 |  |  | 488 |  |  | 140 |  |  | 186 |  |  | 162 |
Large commercial & industrial | 538 |  |  | 223 |  |  | 429 |  |  | 1,124 |  |  | 846 |  |  | 100 |  |  | 178 |
Public authorities & electric railroads | 47 |  |  | 28 |  |  | 28 |  |  | 58 |  |  | 32 |  |  | 14 |  |  | 12 |
Other(a) | 867 |  |  | 243 |  |  | 327 |  |  | 593 |  |  | 193 |  |  | 175 |  |  | 227 |
Total rate-regulated electric revenues(b) | 5,881 |  |  | 2,464 |  |  | 2,423 |  |  | 4,614 |  |  | 2,232 |  |  | 1,144 |  |  | 1,240 |
Rate-regulated natural gas revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | — |  |  | 395 |  |  | 491 |  |  | 99 |  |  | — |  |  | 99 |  |  | — |
Small commercial & industrial | — |  |  | 143 |  |  | 77 |  |  | 44 |  |  | — |  |  | 44 |  |  | — |
Large commercial & industrial | — |  |  | 1 |  |  | 124 |  |  | 8 |  |  | — |  |  | 8 |  |  | — |
Transportation | — |  |  | 23 |  |  | — |  |  | 16 |  |  | — |  |  | 16 |  |  | — |
Other(c) | — |  |  | 6 |  |  | 63 |  |  | 13 |  |  | — |  |  | 13 |  |  | — |
Total rate-regulated natural gas revenues(d) | — |  |  | 568 |  |  | 755 |  |  | 180 |  |  | — |  |  | 180 |  |  | — |
Total rate-regulated revenues from contracts with customers | 5,881 |  |  | 3,032 |  |  | 3,178 |  |  | 4,794 |  |  | 2,232 |  |  | 1,324 |  |  | 1,240 |
Other revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from alternative revenue programs | (29 | ) |  | (7 | ) |  | (26 | ) |  | — |  |  | — |  |  | 4 |  |  | (4 | )
Other rate-regulated electric revenues(e) | 30 |  |  | 12 |  |  | 13 |  |  | 10 |  |  | 7 |  |  | 3 |  |  | — |
Other rate-regulated natural gas revenues(e) | — |  |  | 1 |  |  | 4 |  |  | 1 |  |  | — |  |  | 1 |  |  | — |
Total other revenues | 1 |  |  | 6 |  |  | (9 | ) |  | 11 |  |  | 7 |  |  | 8 |  |  | (4 | )
Total rate-regulated revenues for reportable segments | $ | 5,882 |  |  | $ | 3,038 |  |  | $ | 3,169 |  |  | $ | 4,805 |  |  | $ | 2,239 |  |  | $ | 1,332 |  |  | $ | 1,236 |
| 2017
|  |  |  |  |  |  | Successor |  |  |  |  |  |
Revenues from contracts with customers | ComEd |  | PECO |  | BGE |  | PHI |  | Pepco |  | DPL |  | ACE
Rate-regulated electric revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | $ | 2,715 |  |  | $ | 1,505 |  |  | $ | 1,365 |  |  | $ | 2,246 |  |  | $ | 964 |  |  | $ | 663 |  |  | $ | 619 |
Small commercial & industrial | 1,363 |  |  | 401 |  |  | 254 |  |  | 490 |  |  | 137 |  |  | 187 |  |  | 166 |
Large commercial & industrial | 455 |  |  | 223 |  |  | 427 |  |  | 1,086 |  |  | 794 |  |  | 103 |  |  | 189 |
Public authorities & electric railroads | 44 |  |  | 30 |  |  | 31 |  |  | 60 |  |  | 33 |  |  | 14 |  |  | 13 |
Other(a) | 886 |  |  | 204 |  |  | 299 |  |  | 541 |  |  | 199 |  |  | 163 |  |  | 191 |
Total rate-regulated electric revenues(b) | 5,463 |  |  | 2,363 |  |  | 2,376 |  |  | 4,423 |  |  | 2,127 |  |  | 1,130 |  |  | 1,178 |
Rate-regulated natural gas revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | — |  |  | 331 |  |  | 437 |  |  | 90 |  |  | — |  |  | 90 |  |  | — |
Small commercial & industrial | — |  |  | 131 |  |  | 75 |  |  | 38 |  |  | — |  |  | 38 |  |  | — |
Large commercial & industrial | — |  |  | 1 |  |  | 119 |  |  | 8 |  |  | — |  |  | 8 |  |  | — |
Transportation | — |  |  | 23 |  |  | — |  |  | 15 |  |  | — |  |  | 15 |  |  | — |
Other(c) | — |  |  | 8 |  |  | 28 |  |  | 9 |  |  | — |  |  | 9 |  |  | — |
Total rate-regulated natural gas revenues(d) | — |  |  | 494 |  |  | 659 |  |  | 160 |  |  | — |  |  | 160 |  |  | — |
Total rate-regulated revenues from contracts with customers | 5,463 |  |  | 2,857 |  |  | 3,035 |  |  | 4,583 |  |  | 2,127 |  |  | 1,290 |  |  | 1,178 |
Other revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from alternative revenue programs | 43 |  |  | — |  |  | 124 |  |  | 40 |  |  | 26 |  |  | 6 |  |  | 8 |
Other rate-regulated electric revenues(e) | 30 |  |  | 12 |  |  | 13 |  |  | 8 |  |  | 5 |  |  | 3 |  |  | — |
Other rate-regulated natural gas revenues(e) | — |  |  | 1 |  |  | 4 |  |  | 1 |  |  | — |  |  | 1 |  |  | — |
Other revenues(f) | — |  |  | — |  |  | — |  |  | 47 |  |  | — |  |  | — |  |  | — |
Total other revenues | 73 |  |  | 13 |  |  | 141 |  |  | 96 |  |  | 31 |  |  | 10 |  |  | 8 |
Total rate-regulated revenues for reportable segments | $ | 5,536 |  |  | $ | 2,870 |  |  | $ | 3,176 |  |  | $ | 4,679 |  |  | $ | 2,158 |  |  | $ | 1,300 |  |  | $ | 1,186 |
|  |  |  |  |  |  |  |  |  |  |  |  | Successor |  |  | Predecessor
| 2016 |  | March 24, 2016 to December 31, 2016 |  |  | January 1, 2016 to March 23, 2016
Revenues from contracts with customers | ComEd |  | PECO |  | BGE |  | Pepco |  | DPL |  | ACE |  | PHI |  |  | PHI
Rate-regulated electric revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | $ | 2,603 |  |  | $ | 1,631 |  |  | $ | 1,504 |  |  | $ | 1,004 |  |  | $ | 672 |  |  | $ | 664 |  |  | $ | 1,779 |  |  |  | $ | 561 |
Small commercial & industrial | 1,318 |  |  | 430 |  |  | 276 |  |  | 150 |  |  | 188 |  |  | 183 |  |  | 400 |  |  |  | 121 |
Large commercial & industrial | 462 |  |  | 234 |  |  | 434 |  |  | 790 |  |  | 99 |  |  | 201 |  |  | 835 |  |  |  | 255 |
Public authorities & electric railroads | 45 |  |  | 32 |  |  | 35 |  |  | 32 |  |  | 13 |  |  | 13 |  |  | 45 |  |  |  | 13 |
Other(a) | 820 |  |  | 192 |  |  | 276 |  |  | 190 |  |  | 160 |  |  | 187 |  |  | 400 |  |  |  | 169 |
Total rate-regulated electric revenues(b) | 5,248 |  |  | 2,519 |  |  | 2,525 |  |  | 2,166 |  |  | 1,132 |  |  | 1,248 |  |  | 3,459 |  |  |  | 1,119 |
Rate-regulated natural gas revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | — |  |  | 309 |  |  | 432 |  |  | — |  |  | 86 |  |  | — |  |  | 50 |  |  |  | 36 |
Small commercial & industrial | — |  |  | 121 |  |  | 66 |  |  | — |  |  | 35 |  |  | — |  |  | 21 |  |  |  | 14 |
Large commercial & industrial | — |  |  | — |  |  | 114 |  |  | — |  |  | 6 |  |  | — |  |  | 4 |  |  |  | 2 |
Transportation | — |  |  | 24 |  |  | — |  |  | — |  |  | 13 |  |  | — |  |  | 10 |  |  |  | 3 |
Other(c) | — |  |  | 9 |  |  | 28 |  |  | — |  |  | 8 |  |  | — |  |  | 7 |  |  |  | 2 |
Total rate-regulated natural gas revenues(d) | — |  |  | 463 |  |  | 640 |  |  | — |  |  | 148 |  |  | — |  |  | 92 |  |  |  | 57 |
Total rate-regulated revenues from contracts with customers | 5,248 |  |  | 2,982 |  |  | 3,165 |  |  | 2,166 |  |  | 1,280 |  |  | 1,248 |  |  | 3,551 |  |  |  | 1,176 |
Other revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from alternative revenue programs | (24 | ) |  | — |  |  | 53 |  |  | 14 |  |  | (6 | ) |  | 9 |  |  | 43 |  |  |  | (26 | )
Other rate-regulated electric revenues(e) | 30 |  |  | 12 |  |  | 13 |  |  | 6 |  |  | 3 |  |  | — |  |  | 6 |  |  |  | 3 |
Other rate-regulated natural gas revenues(e) | — |  |  | — |  |  | 2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  | — |
Other revenues(f) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 43 |  |  |  | — |
Total other revenues | 6 |  |  | 12 |  |  | 68 |  |  | 20 |  |  | (3 | ) |  | 9 |  |  | 92 |  |  |  | (23 | )
Total rate-regulated revenues for reportable segments | $ | 5,254 |  |  | $ | 2,994 |  |  | $ | 3,233 |  |  | $ | 2,186 |  |  | $ | 1,277 |  |  | $ | 1,257 |  |  | $ | 3,643 |  |  |  | $ | 1,153 |
__________
(a) | Includes revenues from transmission revenue from PJM, wholesale electric revenue and mutual assistance revenue.
(b) | Includes operating revenues from affiliates of $27 million, $7 million, $8 million, $15 million, $6 million, $8 million and $3 million at ComEd, PECO, BGE, PHI, Pepco, DPL and ACE, respectively, in 2018, $15 million, $6 million, $5 million, $3 million, $6 million, $8 million and $2 million at ComEd, PECO, BGE, PHI, Pepco, DPL and ACE, in 2017, and $15 million, $7 million, $7 million, $2 million, $5 million, $7 million and $3 million at ComEd, PECO, BGE, PHI, Pepco, DPL and ACE, respectively, in 2016.
(c) | Includes revenues from off-system natural gas sales.
(d) | Includes operating revenues from affiliates of $1 million and $21 million at PECO and BGE, respectively, in 2018, $1 million and $11 million at PECO and BGE, respectively, in 2017, and $1 million and $14 million at PECO and BGE, respectively, in 2016.
(e) | Includes late payment charge revenues.
(f) | Includes operating revenues from affiliates of $47 million and $43 million at PHI in 2017 and 2016, respectively.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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