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Fair Value (Nonrecurring Unobservable Inputs) (Details) (USD $) | Dec. 31, 2013 DP&L (Conesville) | Sep. 30, 2013 Itabo (San Lorenzo) | Dec. 31, 2013 Discounted Cash Flow Long Lived Assets Held And Used Beaver Valley | Dec. 31, 2013 Discounted Cash Flow Minimum Long Lived Assets Held And Used Beaver Valley | Dec. 31, 2013 Discounted Cash Flow Minimum Long Lived Assets Held And Used DP&L (Conesville) | Dec. 31, 2013 Discounted Cash Flow Minimum Equity Method Affiliate Elsta | Dec. 31, 2013 Discounted Cash Flow Maximum Long Lived Assets Held And Used Beaver Valley | Dec. 31, 2013 Discounted Cash Flow Maximum Long Lived Assets Held And Used DP&L (Conesville) | Dec. 31, 2013 Discounted Cash Flow Maximum Equity Method Affiliate Elsta | Dec. 31, 2013 Discounted Cash Flow Weighted Average Long Lived Assets Held And Used Beaver Valley | Dec. 31, 2013 Discounted Cash Flow Weighted Average Long Lived Assets Held And Used DP&L (Conesville) | Dec. 31, 2013 Discounted Cash Flow Weighted Average Equity Method Affiliate Elsta | Dec. 31, 2013 Market Approach Long Lived Assets Held And Used Itabo (San Lorenzo) | Dec. 31, 2013 Fair Value Level 3 | Dec. 31, 2013 Fair Value Level 3 Long Lived Assets Held And Used Beaver Valley | Dec. 31, 2013 Fair Value Level 3 Long Lived Assets Held And Used DP&L (Conesville) | Dec. 31, 2013 Fair Value Level 3 Long Lived Assets Held And Used Itabo (San Lorenzo) | Dec. 31, 2013 Fair Value Level 3 Equity Method Affiliate | Dec. 31, 2012 Fair Value Level 3 Equity Method Affiliate
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Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset fair value nonrecurring | $ 0 | $ 7,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 133,000,000 | $ 15,000,000 | [1] | $ 0 | [1] | $ 7,000,000 | [1] | $ 111,000,000 | [2] | $ 0
Annual revenue growth |  |  |  | 3.00% | (31.00%) | (66.00%) | 45.00% | 18.00% | 24.00% | 19.00% | 0.00% | 0.00% |  |  |  |  |  |  |  |  |  |  |
Annual pretax operating margin |  |  |  | (42.00%) | (9.00%) | 15.00% | 41.00% | 18.00% | 68.00% | 25.00% | 10.00% | 40.00% |  |  |  |  |  |  |  |  |  |  |
Weighted average cost of capital |  |  | 7.00% |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |
Broker quote |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  |  |  |
Cost of Equity |  |  |  |  |  | 7.80% |  |  | 9.80% |  |  | 8.40% |  |  |  |  |  |  |  |  |  |  |
[1] | See Note 21 — Asset Impairment Expense for further information.
[2] | See Note 9 — Other Non-Operating Expense for further information.

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