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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2015
Property, Plant and Equipment [Abstract] |
Property, Pland and Equipment with Useful Life Classification | The following table summarizes the components of the electric generation and distribution assets and other property, plant and equipment (in millions) with their estimated useful lives (in years). The amounts are stated net of all prior asset impairment losses recognized.
|  |  | December 31,
| Estimated Useful Life | 2015 |  | 2014
Electric generation and distribution facilities | 5 - 68 |  | $ | 25,427 |  |  | $ | 27,488 |
Other buildings | 3 - 53 |  | 1,868 |  |  | 1,694 |
Furniture, fixtures and equipment | 2 - 31 |  | 305 |  |  | 307 |
Other | 1 - 50 |  | 891 |  |  | 970 |
Total electric generation and distribution assets and other |  |  | 28,491 |  |  | 30,459 |
Accumulated depreciation |  |  | (9,449 | ) |  | (9,962 | )
Net electric generation and distribution assets and other (1) |  |  | $ | 19,042 |  |  | $ | 20,497 |
(1) | Net electric generation and distribution assets and other include unamortized internal-use software costs of $83 million and $115 million as of December 31, 2015 and 2014, respectively
Interest Capitalized During Development And Construction | The following table summarizes depreciation expense (including the amortization of assets recorded under capital leases), amortization of internal-use software and interest capitalized during development and construction on qualifying assets for the periods indicated (in millions):
Year Ended December 31, |  | 2015 |  | 2014 |  | 2013
Depreciation expense (including amortization of assets recorded under capital leases) |  | $ | 1,104 |  |  | $ | 1,204 |  |  | $ | 1,193 |
Amortization of internal-use software |  | 29 |  |  | 33 |  |  | 36 |
Interest capitalized during development and construction |  | 90 |  |  | 120 |  |  | 84 |
Net Asset Value Of Regulated And Non-Regulated Assets And Accumulated Depreciation | The following table summarizes regulated and non-regulated generation and distribution property, plant and equipment and accumulated depreciation in millions as of the periods indicated:
December 31, |  | 2015 |  | 2014
Regulated generation, distribution assets and other, gross |  | $ | 11,818 |  |  | $ | 13,103 |
Regulated accumulated depreciation |  | (4,351 | ) |  | (4,841 | )
Regulated generation, distribution assets and other, net |  | 7,467 |  |  | 8,262 |
Non-regulated generation, distribution assets and other, gross |  | 16,673 |  |  | 17,356 |
Non-regulated accumulated depreciation |  | (5,098 | ) |  | (5,121 | )
Non-regulated generation, distribution assets and other, net |  | 11,575 |  |  | 12,235 |
Net electric generation, distribution assets and other |  | $ | 19,042 |  |  | $ | 20,497 |
Schedule of Change in Asset Retirement Obligation | The next table presents amounts recognized related to asset retirement obligations in millions for the periods indicated:
|  | 2015 |  | 2014
Balance at January 1 |  | $ | 209 |  |  | $ | 142 |
Additional liabilities incurred |  | 43 |  |  | 51 |
Liabilities settled |  | (6 | ) |  | (11 | )
Accretion expense |  | 13 |  |  | 12 |
Change in estimated cash flows |  | (7 | ) |  | 15 |
Other |  | (5 | ) |  | — |
Balance at December 31 |  | $ | 247 |  |  | $ | 209 |
Schedule of Jointly Owned Utility Plants | DP&L's undivided ownership interest in such facilities at December 31, 2015 is as follows:
| DP&L Share |  | DP&L Investment
| Ownership |  | Gross Plant In Service |  | Accumulated Depreciation |  | Construction Work In Process
Production units: |  |  | ($ in millions)
Conesville Unit 4 | 17 | % |  | $ | 26 |  |  | $ | 4 |  |  | $ | 1 |
Killen Station | 67 | % |  | 342 |  |  | 29 |  |  | 2 |
Miami Fort Units 7 and 8 | 36 | % |  | 219 |  |  | 32 |  |  | 6 |
Stuart Station | 35 | % |  | 236 |  |  | 19 |  |  | 18 |
Zimmer Station | 28 | % |  | 188 |  |  | 44 |  |  | 12 |
Transmission | various |  |  | 43 |  |  | 8 |  |  | — |
Total |  |  | $ | 1,054 |  |  | $ | 136 |  |  | $ | 39 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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- Definition Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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