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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
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.