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Property, Plant and Equipment (All Registrants) | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment (All Registrants) | Property, Plant and Equipment (All Registrants) 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.
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.
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.
The annual depreciation provisions as a percentage of average service life for electric generation assets were 5.37%, 4.36% and 5.94% for the years ended December 31, 2018, 2017 and 2016, respectively. See Note 8 — Early Plant Retirements for additional information on the accelerated depreciation and amortization of Clinton, Quad Cities, Oyster Creek and TMI. License Renewals Depreciation provisions are based on the estimated useful lives of the stations, which reflect the actual renewal of the operating licenses for all of Generation's operating nuclear generating stations except for TMI and Clinton. As a result, the receipt of license renewals has no material impact in the Consolidated Statements of Operations and Comprehensive Income. Beginning in 2017, TMI and Oyster Creek depreciation provisions were based on their 2019 expected shutdown dates. Beginning February 2018, Oyster Creek depreciation provisions were based on its announced shutdown date of September 2018. Clinton depreciation provisions are based on an estimated useful life through 2027 which is the last year of the Illinois Zero Emissions Standard. See Note 4 — Regulatory Matters for additional information regarding license renewals and the Illinois ZECs and Note 8 — Early Plant Retirements for additional information on the impacts of expected and potential early plant retirement. 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.
The annual depreciation provisions as a percentage of average service life for electric transmission and distribution assets were 2.95%, 2.99% and 3.03% for the years ended December 31, 2018, 2017 and 2016, respectively. 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.
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 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.
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 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.
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 | %
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.
The annual depreciation provisions as a percentage of average service life for electric transmission and distribution assets were 2.40%, 2.35% and 2.17% for the years ended December 31, 2018, 2017 and 2016, respectively. 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.
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 | %
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.
The annual depreciation provisions as a percentage of average service life for electric transmission and distribution assets were 2.45%, 2.46% and 2.45% for the years ended December 31, 2018, 2017 and 2016, respectively. 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 |
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.
See Note 1 — Significant Accounting Policies for additional information regarding property, plant and equipment policies. See Note 13 — Debt and Credit Agreements for additional information regarding Exelon’s, ComEd’s and PECO’s property, plant and equipment subject to mortgage liens.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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