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Property Plant and Equipment | 12 Months Ended
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Dec. 31, 2015
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | PROPERTY, PLANT AND EQUIPMENT 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.
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 |
Property, plant and equipment, net of accumulated depreciation, of $12 billion and $15 billion was mortgaged, pledged or subject to liens as of December 31, 2015 and 2014, respectively. 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 |
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 |
The Company's asset retirement obligations covered by the relevant guidance primarily include active ash landfills, water treatment basins and the removal or dismantlement of certain plants and equipment. There were $2 million of legally restricted assets for the year ended December 31, 2015 and none for the year ended December 31, 2014 for purposes of settling asset retirement obligations. Ownership of Certain Coal-Fired Facilities DP&L has undivided ownership interests in five coal-fired generation facilities jointly owned with other utilities. DP&L's share of the operating costs of such facilities is included in Cost of Sales in the Consolidated Statements of Operations and its share of investment in the facilities is included in Property, Plant and Equipment in the Consolidated Balance Sheets. DP&L's undivided ownership interest in such facilities at December 31, 2015 is as follows:
| DP&L Share |  | DP&L Investment
| Ownership |  | Gross Plant In Service |  | Accumulated Depreciation |  | Construction Work In Process
Production units: |  |  | ($ 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 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -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 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 4: 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 + Details
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