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Property, Plant, and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment | Exelon The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
| Average Service Life (years) |  | 2018 |  | 2017
Asset Category |  |  |  |  |
Electric—transmission and distribution | 5-90 |  | $ | 53,090 |  |  | $ | 49,506 |
Electric—generation | 1-56 |  | 29,170 |  |  | 29,019 |
Gas—transportation and distribution | 5-90 |  | 5,530 |  |  | 5,050 |
Common—electric and gas | 5-75 |  | 1,627 |  |  | 1,447 |
Nuclear fuel (a) | 1-8 |  | 5,957 |  |  | 6,420 |
Construction work in progress | N/A |  | 3,377 |  |  | 2,825 |
Other property, plant and equipment (b) | 1-50 |  | 858 |  |  | 999 |
Total property, plant and equipment |  |  | 99,609 |  |  | 95,266 |
Less: accumulated depreciation (c) |  |  | 22,902 |  |  | 21,064 |
Property, plant and equipment, net |  |  | $ | 76,707 |  |  | $ | 74,202 |
__________
(a) | Includes nuclear fuel that is in the fabrication and installation phase of $1,004 million and $1,196 million at December 31, 2018 and 2017, respectively.
(b) | Includes Generation’s buildings under capital lease with a net carrying value of $5 million and $7 million at December 31, 2018 and 2017, respectively. The original cost basis of the buildings was $47 million as of both December 31, 2018 and 2017, and total accumulated amortization was $42 million and $40 million, as of December 31, 2018 and 2017, respectively. Also includes ComEd’s buildings under capital lease with a net carrying value at both December 31, 2018 and 2017, of $7 million. The original cost basis of the buildings was $8 million and total accumulated amortization was $1 million as of both December 31, 2018 and 2017. Includes land held for future use and non-utility property at ComEd, PECO, BGE, Pepco, DPL and ACE of $39 million, $19 million, $25 million, $61 million, $17 million and $28 million, respectively, at December 31, 2018.
(c) | Includes accumulated amortization of nuclear fuel in the reactor core at Generation of $2,969 million and $3,159 million as of December 31, 2018 and 2017, respectively.
Generation The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
| Average Service Life (years) |  | 2018 |  | 2017
Asset Category |  |  |  |  |
Electric—generation | 1-56 |  | $ | 29,170 |  |  | $ | 29,019 |
Nuclear fuel (a) | 1-8 |  | 5,957 |  |  | 6,420 |
Construction work in progress | N/A |  | 997 |  |  | 838 |
Other property, plant and equipment (b) | 1-8 |  | 63 |  |  | 57 |
Total property, plant and equipment |  |  | 36,187 |  |  | 36,334 |
Less: accumulated depreciation (c) |  |  | 12,206 |  |  | 11,428 |
Property, plant and equipment, net |  |  | $ | 23,981 |  |  | $ | 24,906 |
__________
(a) | Includes nuclear fuel that is in the fabrication and installation phase of $1,004 million and $1,196 million at December 31, 2018 and 2017, respectively.
(b) | Includes buildings under capital lease with a net carrying value of $5 million and $7 million at December 31, 2018 and 2017, respectively. The original cost basis of the buildings was $47 million as of both December 31, 2018 and 2017, and total accumulated amortization was $42 million and $40 million, as of December 31, 2018 and 2017, respectively.
(c) | Includes accumulated amortization of nuclear fuel in the reactor core of $2,969 million and $3,159 million as of December 31, 2018 and 2017, respectively.
ComEd The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
| Average Service Life (years) |  | 2018 |  | 2017
Asset Category |  |  |  |  |
Electric—transmission and distribution | 5-80 |  | $ | 25,991 |  |  | $ | 24,423 |
Construction work in progress | N/A |  | 705 |  |  | 517 |
Other property, plant and equipment (a), (b) | 35-50 |  | 46 |  |  | 52 |
Total property, plant and equipment |  |  | 26,742 |  |  | 24,992 |
Less: accumulated depreciation |  |  | 4,684 |  |  | 4,269 |
Property, plant and equipment, net |  |  | $ | 22,058 |  |  | $ | 20,723 |
__________
(a) | Includes buildings under capital lease with a net carrying value at both December 31, 2018 and 2017 of $7 million. The original cost basis of the buildings was $8 million and total accumulated amortization was $1 million as of both December 31, 2018 and 2017.
(b) | Represents land held for future use and non-utility property.
PECO The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
| Average Service Life (years) |  | 2018 |  | 2017
Asset Category |  |  |  |  |
Electric—transmission and distribution | 5-65 |  | $ | 8,359 |  |  | $ | 7,975 |
Gas—transportation and distribution | 5-70 |  | 2,694 |  |  | 2,504 |
Common—electric and gas | 5-50 |  | 756 |  |  | 710 |
Construction work in progress | N/A |  | 343 |  |  | 254 |
Other property, plant and equipment (a) | 50 |  | 19 |  |  | 21 |
Total property, plant and equipment |  |  | 12,171 |  |  | 11,464 |
Less: accumulated depreciation |  |  | 3,561 |  |  | 3,411 |
Property, plant and equipment, net |  |  | $ | 8,610 |  |  | $ | 8,053 |
__________
(a) | Represents land held for future use and non-utility property.
BGE The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
| Average Service Life (years) |  | 2018 |  | 2017
Asset Category |  |  |  |  |
Electric—transmission and distribution | 5-90 |  | $ | 7,951 |  |  | $ | 7,464 |
Gas—distribution | 5-90 |  | 2,630 |  |  | 2,379 |
Common—electric and gas | 5-40 |  | 860 |  |  | 771 |
Construction work in progress | N/A |  | 410 |  |  | 367 |
Other property, plant and equipment (a) | 20 |  | 25 |  |  | 26 |
Total property, plant and equipment |  |  | 11,876 |  |  | 11,007 |
Less: accumulated depreciation |  |  | 3,633 |  |  | 3,405 |
Property, plant and equipment, net |  |  | $ | 8,243 |  |  | $ | 7,602 |
__________
(a) | Represents plant held for future use and non-utility property.
PHI The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
| Average Service Life (years) |  | 2018 |  | 2017
Asset Category |  |  |  |  |
Electric—transmission and distribution | 5-75 |  | $ | 12,664 |  |  | $ | 11,517 |
Gas—distribution | 5-75 |  | 486 |  |  | 449 |
Common—electric and gas | 5-75 |  | 126 |  |  | 82 |
Construction work in progress | N/A |  | 912 |  |  | 835 |
Other property, plant and equipment (a) | 3-43 |  | 99 |  |  | 102 |
Total property, plant and equipment |  |  | 14,287 |  |  | 12,985 |
Less: accumulated depreciation |  |  | 841 |  |  | 487 |
Property, plant and equipment, net |  |  | $ | 13,446 |  |  | $ | 12,498 |
__________
(a) | Represents plant held for future use and non-utility property.
Pepco The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
| Average Service Life (years) |  | 2018 |  | 2017
Asset Category |  |  |  |  |
Electric—transmission and distribution | 5-75 |  | $ | 9,217 |  |  | $ | 8,646 |
Construction work in progress | N/A |  | 536 |  |  | 473 |
Other property, plant and equipment (a) | 25-33 |  | 61 |  |  | 59 |
Total property, plant and equipment |  |  | 9,814 |  |  | 9,178 |
Less: accumulated depreciation |  |  | 3,354 |  |  | 3,177 |
Property, plant and equipment, net |  |  | $ | 6,460 |  |  | $ | 6,001 |
__________
(a) | Represents plant held for future use and non-utility property.
DPL The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
| Average Service Life (years) |  | 2018 |  | 2017
Asset Category |  |  |  |  |
Electric—transmission and distribution | 5-70 |  | $ | 4,195 |  |  | $ | 3,875 |
Gas—distribution | 5-75 |  | 651 |  |  | 614 |
Common—electric and gas | 5-75 |  | 136 |  |  | 117 |
Construction work in progress | N/A |  | 151 |  |  | 205 |
Other property, plant and equipment (a) | 10-43 |  | 17 |  |  | 15 |
Total property, plant and equipment |  |  | 5,150 |  |  | 4,826 |
Less: accumulated depreciation |  |  | 1,329 |  |  | 1,247 |
Property, plant and equipment, net |  |  | $ | 3,821 |  |  | $ | 3,579 |
__________
(a) | Represents plant held for future use and non-utility property.
ACE The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
| Average Service Life (years) |  | 2018 |  | 2017
Asset Category |  |  |  |  |
Electric—transmission and distribution | 5-60 |  | $ | 3,866 |  |  | $ | 3,607 |
Construction work in progress | N/A |  | 209 |  |  | 138 |
Other property, plant and equipment (a) | 13-15 |  | 28 |  |  | 27 |
Total property, plant and equipment |  |  | 4,103 |  |  | 3,772 |
Less: accumulated depreciation |  |  | 1,137 |  |  | 1,066 |
Property, plant and equipment, net |  |  | $ | 2,966 |  |  | $ | 2,706 |
__________
(a) | Represents plant held for future use and non-utility property.
Property Plant And Equipment Average Service Life Percentage By Asset Category Table | Exelon The following table presents the annual depreciation provisions as a percentage of average service life for each asset category.
Average Service Life Percentage by Asset Category | 2018 |  | 2017 |  | 2016
Electric—transmission and distribution | 2.73 | % |  | 2.75 | % |  | 2.73 | %
Electric—generation(a) | 5.37 | % |  | 4.36 | % |  | 5.94 | %
Gas | 2.07 | % |  | 2.10 | % |  | 2.17 | %
Common—electric and gas | 6.98 | % |  | 7.05 | % |  | 7.41 | %
__________
(a) | See Note 8 — Early Plant Retirements for additional information on the accelerated net depreciation and amortization of Clinton, Quad Cities, Oyster Creek and TMI.
PECO The following table presents the annual depreciation provisions as a percentage of average service life for each asset category.
Average Service Life Percentage by Asset Category | 2018 |  | 2017 |  | 2016
Electric—transmission and distribution | 2.35 | % |  | 2.37 | % |  | 2.32 | %
Gas | 1.90 | % |  | 1.89 | % |  | 1.82 | %
Common—electric and gas | 5.44 | % |  | 5.47 | % |  | 5.11 | %
BGE The following table presents the annual depreciation provisions as a percentage of average service life for each asset category.
Average Service Life Percentage by Asset Category | 2018 |  | 2017 |  | 2016
Electric—transmission and distribution | 2.61 | % |  | 2.58 | % |  | 2.56 | %
Gas | 2.36 | % |  | 2.33 | % |  | 2.45 | %
Common—electric and gas | 8.50 | % |  | 8.64 | % |  | 9.45 | %
PHI The following table presents the annual depreciation provisions as a percentage of average service life for each asset category.
Average Service Life Percentage by Asset Category | 2018 |  | 2017 |  | 2016
Electric—transmission and distribution | 2.61 | % |  | 2.63 | % |  | 2.52 | %
Gas | 1.59 | % |  | 2.07 | % |  | 2.57 | %
Common—electric and gas | 6.30 | % |  | 6.50 | % |  | 8.12 | %
DPL The following table presents the annual depreciation provisions as a percentage of average service life for each asset category.
Average Service Life Percentage by Asset Category | 2018 |  | 2017 |  | 2016
Electric—transmission and distribution | 2.77 | % |  | 2.75 | % |  | 2.49 | %
Gas | 1.59 | % |  | 2.07 | % |  | 2.57 | %
Common—electric and gas | 3.70 | % |  | 4.14 | % |  | 4.99 | %
Schedule Of Capitalized Software | Capitalized Software Costs (All Registrants) The following tables presents net unamortized capitalized software costs and amortization of capitalized software costs by year.
Net unamortized software costs | Exelon |  | Generation |  | ComEd |  | PECO |  | BGE |  | PHI |  | Pepco |  | DPL |  | ACE
December 31, 2018 | $ | 810 |  |  | $ | 164 |  |  | $ | 206 |  |  | $ | 98 |  |  | $ | 166 |  |  | $ | 165 |  |  | $ | 26 |  |  | $ | 21 |  |  | $ | 14 |
December 31, 2017 | 834 |  |  | 173 |  |  | 227 |  |  | 111 |  |  | 179 |  |  | 133 |  |  | 2 |  |  | 1 |  |  | 1 |
Amortization of capitalized software costs | Exelon |  | Generation |  | ComEd |  | PECO |  | BGE |  | Pepco |  | DPL |  | ACE
2018 | $ | 282 |  |  | $ | 78 |  |  | $ | 79 |  |  | $ | 37 |  |  | $ | 48 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 1 |
2017 | 270 |  |  | 73 |  |  | 73 |  |  | 39 |  |  | 46 |  |  | — |  |  | — |  |  | — |
2016 | 255 |  |  | 72 |  |  | 62 |  |  | 33 |  |  | 44 |  |  | — |  |  | — |  |  | — |
| Successor |  |  | Predecessor
PHI | For the year ended December 31, 2018 |  | For the year ended December 31, 2017 |  | March 24, 2016 to December 31, 2016 |  |  | January 1, 2016 to March 23, 2016
Amortization of capitalized software costs | $ | 33 |  |  | $ | 34 |  |  | $ | 29 |  |  |  | $ | 8 |
Schedule Of Capitalized Interest And AFUDC | Capitalized Interest and AFUDC (All Registrants) The following table summarizes total incurred interest, capitalized interest and credits to AFUDC by year:
|  | Exelon |  | Generation |  | ComEd |  | PECO |  | BGE |  | Pepco |  | DPL |  | ACE
2018 | Total incurred interest(a) | $ | 1,695 |  |  | $ | 464 |  |  | $ | 377 |  |  | $ | 141 |  |  | $ | 130 |  |  | $ | 162 |  |  | $ | 62 |  |  | $ | 68 |
| Capitalized interest | 31 |  |  | 31 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
| Credits to AFUDC debt and equity | 109 |  |  | — |  |  | 30 |  |  | 12 |  |  | 24 |  |  | 34 |  |  | 4 |  |  | 4 |
2017 | Total incurred interest(a) | $ | 1,658 |  |  | $ | 502 |  |  | $ | 369 |  |  | $ | 130 |  |  | $ | 111 |  |  | $ | 133 |  |  | $ | 54 |  |  | $ | 64 |
| Capitalized interest | 63 |  |  | 63 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
| Credits to AFUDC debt and equity | 108 |  |  | — |  |  | 20 |  |  | 12 |  |  | 22 |  |  | 34 |  |  | 10 |  |  | 9 |
2016 | Total incurred interest(a) | $ | 1,678 |  |  | $ | 472 |  |  | $ | 469 |  |  | $ | 127 |  |  | $ | 114 |  |  | $ | 137 |  |  | $ | 52 |  |  | $ | 65 |
| Capitalized interest | 108 |  |  | 107 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
| Credits to AFUDC debt and equity | 98 |  |  | — |  |  | 22 |  |  | 11 |  |  | 30 |  |  | 29 |  |  | 7 |  |  | 9 |
| Successor |  |  | Predecessor
PHI | For the year ended December 31, 2018 |  | For the year ended December 31, 2017 |  | March 24, 2016 to December 31, 2016 |  |  | January 1, 2016 to March 23, 2016
Total incurred interest(a) | $ | 305 |  |  | $ | 263 |  |  | $ | 207 |  |  |  | $ | 68 |
Credits to AFUDC debt and equity | 44 |  |  | 54 |  |  | 35 |  |  |  | 10 |
__________
(a) | Includes interest expense to affiliates.

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