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Property Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2011
Property Plant And Equipment Tables [Abstract] |
PP&E With Useful Life Classification |
|  | Estimated |  | December 31,
|  | Useful Life |  | 2011 |  | 2010
|  |  |  | (in millions)
Electric generation and distribution facilities |  | 5 - 69 yrs. |  | $ | 27,627 |  | $ | 23,133
Other buildings |  | 3 - 50 yrs. |  |  | 2,927 |  |  | 2,085
Furniture, fixtures and equipment |  | 3 - 31 yrs. |  |  | 481 |  |  | 484
Other |  | 1 - 46 yrs. |  |  | 913 |  |  | 812
Total electric generation and distribution assets and other |  |  |  |  | 31,948 |  |  | 26,514
Accumulated depreciation |  |  |  |  | (9,145) |  |  | (8,643)
Net electric generation and distribution assets and other(1) |  |  |  | $ | 22,803 |  | $ | 17,871
Interest Capitalized During Development And Construction |
|  | 2011 |  | 2010 |  | 2009
|  | (in millions)
Interest capitalized during development and construction |  | $ | 176 |  | $ | 188 |  | $ | 183
Net Asset Value Of Regulated And Non-Regulated Assets And Accumulated Depreciation |
|  | December 31,
|  | 2011 |  | 2010
|  | (in millions)
Regulated assets |  | $ | 14,468 |  | $ | 12,006
Regulated accumulated depreciation |  |  | (5,029) |  |  | (4,961)
Regulated generation, distribution assets, and other, net |  |  | 9,439 |  |  | 7,045
Non-regulated assets |  |  | 17,480 |  |  | 14,508
Non-regulated accumulated depreciation |  |  | (4,116) |  |  | (3,682)
Non-regulated generation, distribution assets, and other, net |  |  | 13,364 |  |  | 10,826
Net electric generation and distribution assets, and other |  | $ | 22,803 |  | $ | 17,871
Schedule of Change in Asset Retirement Obligation [Table Text Block] |
|  | 2011 |  | 2010
|  | (in millions)
Balance at January 1 |  | $ | 88 |  | $ | 60
Additional liabilities incurred |  |  | 1 |  |  | 22
Assumed in business combination |  |  | 24 |  |  | -
Accretion expense |  |  | 6 |  |  | 5
Change in estimated cash flows |  |  | (1) |  |  | 1
Translation adjustments |  |  | (1) |  |  | -
Balance at December 31 |  | $ | 117 |  | $ | 88
Schedule of Jointly Owned Utility Plants [Table Text Block] |
|  |  | DP&L Share |  | DP&L Investment
|  |  |  |  | Production |  | Gross |  |  |  | Construction |
|  |  |  |  | Capacity |  | Plant |  | Accumulated |  | Work In |
|  |  | Ownership |  | (MW) |  | In Service |  | Depreciation |  | Process |
|  |  |  |  |  |  | ($ in millions) |
Production Units: |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Beckjord Unit 6 |  | 50% |  | 210 |  | $ | - |  | $ | - |  | $ | - |
| Conesville Unit 4 |  | 17% |  | 129 |  |  | - |  |  | - |  |  | 2 |
| East Bend Station |  | 31% |  | 186 |  |  | - |  |  | - |  |  | 2 |
| Killen Station |  | 67% |  | 402 |  |  | 331 |  |  | - |  |  | 4 |
| Miami Fort Units 7 and 8 |  | 36% |  | 368 |  |  | 239 |  |  | 1 |  |  | 2 |
| Stuart Station |  | 35% |  | 820 |  |  | 181 |  |  | 1 |  |  | 14 |
| Zimmer Station |  | 28% |  | 365 |  |  | 161 |  |  | 2 |  |  | 24 |
Transmission |  | various |  |  |  |  | 34 |  |  | - |  |  | - |
| Total |  |  |  | 2,480 |  | $ | 946 |  | $ | 4 |  | $ | 48 |

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- Definition Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + 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 AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 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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- 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 -Topic 410 -SubTopic 30 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 5 -Section 50 -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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C Reference 2: 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 + Details
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