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Fair Value (Nonrecurring Measurements) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Other Nonoperating Expense $ 0 $ 44,000,000   $ 0 $ 44,000,000
Impairment expenses       45,000,000 273,000,000
Goodwill impairment expense 0 0   0 154,000,000
East Bend DPL [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring   2,000,000     2,000,000
Ebute [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring   47,000,000     47,000,000
UK Wind (Newfield) [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring   0     0
DPLER [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Goodwill impairment expense     $ 136,000,000    
Buffalo Gap [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Goodwill impairment expense     $ 18,000,000    
UK Wind Development Projects [Domain]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring 1,000,000     1,000,000  
Long Lived Assets Held And Used [Member] | East Bend DPL [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Impairment expenses [1]         12,000,000
Long Lived Assets Held And Used [Member] | Ebute [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Impairment expenses [1]         52,000,000
Long Lived Assets Held And Used [Member] | UK Wind (Newfield) [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Impairment expenses [1]         11,000,000
Long Lived Assets Held And Used [Member] | Other Affiliates [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Other Nonoperating Expense [1]       8,000,000  
Long Lived Assets Held And Used [Member] | UK Wind Development Projects [Domain]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Other Nonoperating Expense [1]       37,000,000  
Long Lived Assets Held And Used [Member] | Fair Value [Member] | East Bend DPL [Member] | Level 1 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1]   0     0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | East Bend DPL [Member] | Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1]   2,000,000     2,000,000
Long Lived Assets Held And Used [Member] | Fair Value [Member] | East Bend DPL [Member] | Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1]   0     0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Ebute [Member] | Level 1 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1]   0     0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Ebute [Member] | Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1]   0     0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Ebute [Member] | Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1]   47,000,000     47,000,000
Long Lived Assets Held And Used [Member] | Fair Value [Member] | UK Wind (Newfield) [Member] | Level 1 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1]   0     0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | UK Wind (Newfield) [Member] | Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1]   0     0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | UK Wind (Newfield) [Member] | Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1]   0     0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Affiliates [Member] | Level 1 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1] 0     0  
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Affiliates [Member] | Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1] 21,000,000     21,000,000  
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Affiliates [Member] | Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1] 0     0  
Long Lived Assets Held And Used [Member] | Fair Value [Member] | UK Wind Development Projects [Domain] | Level 1 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1] 0     0  
Long Lived Assets Held And Used [Member] | Fair Value [Member] | UK Wind Development Projects [Domain] | Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1] 1,000,000     1,000,000  
Long Lived Assets Held And Used [Member] | Fair Value [Member] | UK Wind Development Projects [Domain] | Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1] 0     0  
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | East Bend DPL [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1],[2]   14,000,000     14,000,000
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | Ebute [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1],[2]   99,000,000     99,000,000
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | UK Wind (Newfield) [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1],[2]   11,000,000     11,000,000
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | Other Affiliates [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1],[2] 29,000,000     29,000,000  
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | UK Wind Development Projects [Domain]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [1],[2] 38,000,000     38,000,000  
Goodwill [Member] | DPLER [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Goodwill impairment expense [3]         136,000,000
Goodwill [Member] | Buffalo Gap [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Goodwill impairment expense [3]         18,000,000
Goodwill [Member] | Fair Value [Member] | DPLER [Member] | Level 1 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [3]   0     0
Goodwill [Member] | Fair Value [Member] | DPLER [Member] | Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [3]   0     0
Goodwill [Member] | Fair Value [Member] | DPLER [Member] | Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [3]   0     0
Goodwill [Member] | Fair Value [Member] | Buffalo Gap [Member] | Level 1 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [3]   0     0
Goodwill [Member] | Fair Value [Member] | Buffalo Gap [Member] | Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [3]   0     0
Goodwill [Member] | Fair Value [Member] | Buffalo Gap [Member] | Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [3]   10,000,000     10,000,000
Goodwill [Member] | Carrying Amount [Member] | DPLER [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [2],[3]   136,000,000     136,000,000
Goodwill [Member] | Carrying Amount [Member] | Buffalo Gap [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [2],[3]   28,000,000     28,000,000
Equity Method Investments [Member] | Silver Ridge Power [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Other Nonoperating Expense [4]         44,000,000
Equity Method Investments [Member] | Solar Spain [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Other Nonoperating Expense       0  
Equity Method Investments [Member] | Fair Value [Member] | Silver Ridge Power [Member] | Level 1 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [4]   0     0
Equity Method Investments [Member] | Fair Value [Member] | Silver Ridge Power [Member] | Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [4]   0     0
Equity Method Investments [Member] | Fair Value [Member] | Silver Ridge Power [Member] | Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [4]   273,000,000     273,000,000
Equity Method Investments [Member] | Fair Value [Member] | Solar Spain [Member] | Level 1 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring 0     0  
Equity Method Investments [Member] | Fair Value [Member] | Solar Spain [Member] | Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring 0     0  
Equity Method Investments [Member] | Fair Value [Member] | Solar Spain [Member] | Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring 29,000,000     29,000,000  
Equity Method Investments [Member] | Carrying Amount [Member] | Silver Ridge Power [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [2],[4]   317,000,000     317,000,000
Equity Method Investments [Member] | Carrying Amount [Member] | Solar Spain [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [2] $ 29,000,000     $ 29,000,000  
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Cameroon [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Impairment expenses [4]         38,000,000
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Fair Value [Member] | Cameroon [Member] | Level 1 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [4]   0     0
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Fair Value [Member] | Cameroon [Member] | Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [4]   334,000,000     334,000,000
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Fair Value [Member] | Cameroon [Member] | Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [4]   0     0
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Carrying Amount [Member] | Cameroon [Member]          
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]          
Fair Value, Nonrecurring [2],[4]   $ 372,000,000     $ 372,000,000
Income Approach Valuation Technique [Member] | Equity Method Investments [Member] | Minimum [Member] | Solar Spain [Member]          
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items]          
Fair Value Inputs, Long-term Revenue Growth Rate       (3.00%)  
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent       (13.00%)  
Fair Value Inputs, Discount Rate       0.00%  
Income Approach Valuation Technique [Member] | Equity Method Investments [Member] | Maximum [Member] | Solar Spain [Member]          
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items]          
Fair Value Inputs, Long-term Revenue Growth Rate       0.00%  
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent       56.00%  
Fair Value Inputs, Discount Rate       0.00%  
Income Approach Valuation Technique [Member] | Equity Method Investments [Member] | Weighted Average [Member] | Solar Spain [Member]          
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items]          
Fair Value Inputs, Long-term Revenue Growth Rate       0.00%  
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent       24.00%  
Fair Value Inputs, Discount Rate       12.00%  
[1] See Note 15—Asset Impairment Expense for further information.
[2] (1) Represents the carrying value at the date of measurement, before fair value adjustment.
[3] See Note 14—Goodwill Impairment for further information.
[4] See Note 17—Discontinued Operations and Held-For-Sale Businesses for further information.