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Fair Value (Nonrecurring Measurements) (Details) - USD ($)
 2 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Asset Impairment Charges           $ 258,000,000 $ 396,000,000
Other Asset Impairment Charges   $ 90,000,000   $ 235,000,000   258,000,000 394,000,000
Long Lived Assets Held For Sale [Member] | Kazakhstan [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Other Asset Impairment Charges [1]     $ 94,000,000     90,000,000  
Long Lived Assets Held For Sale [Member] | Fair Value [Member] | Kazakhstan [Member] | Level 1 [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [1]   0 0     0  
Long Lived Assets Held For Sale [Member] | Fair Value [Member] | Kazakhstan [Member] | Level 2 [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [1]   92,000,000 29,000,000     92,000,000  
Long Lived Assets Held For Sale [Member] | Fair Value [Member] | Kazakhstan [Member] | Level 3 [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [1]   0 0     0  
Long Lived Assets Held For Sale [Member] | Carrying Amount [Member] | Kazakhstan [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [1],[2]   190,000,000 $ 171,000,000     190,000,000  
Long Lived Assets Held And Used [Member] | DPL Subsidiary [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Other Asset Impairment Charges [3] $ 66,000,000           235,000,000
Long Lived Assets Held And Used [Member] | buffalo gap II [Member] [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring         $ 92,000,000    
Other Asset Impairment Charges [3]         159,000,000    
Long Lived Assets Held And Used [Member] | Energy Storage [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Other Asset Impairment Charges [3]           8,000,000  
Long Lived Assets Held And Used [Member] | Fair Value [Member] | DPL Subsidiary [Member] | Level 1 [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [3] 0     0     0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | DPL Subsidiary [Member] | Level 2 [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [3] 0     0     0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | DPL Subsidiary [Member] | Level 3 [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [3] 11,000,000     89,000,000     89,000,000
Long Lived Assets Held And Used [Member] | Fair Value [Member] | buffalo gap II [Member] [Member] | Level 1 [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [3]         0    
Long Lived Assets Held And Used [Member] | Fair Value [Member] | buffalo gap II [Member] [Member] | Level 2 [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [3]         0    
Long Lived Assets Held And Used [Member] | Fair Value [Member] | buffalo gap II [Member] [Member] | Level 3 [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [3]         92,000,000    
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Energy Storage [Member] | Level 1 [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [3]   0       0  
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Energy Storage [Member] | Level 2 [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [3]   0       0  
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Energy Storage [Member] | Level 3 [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [3]   7,000,000       7,000,000  
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | DPL Subsidiary [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [2],[3] $ 77,000,000     324,000,000     324,000,000
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | buffalo gap II [Member] [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [2],[3]         $ 251,000,000    
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | Energy Storage [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [2],[3]   $ 15,000,000       $ 15,000,000  
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Sul Subsidiary [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Asset Impairment Charges [3]             783,000,000
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Fair Value [Member] | Sul Subsidiary [Member] | Level 1 [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [3]       0     0
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Fair Value [Member] | Sul Subsidiary [Member] | Level 2 [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [3]       470,000,000     470,000,000
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Fair Value [Member] | Sul Subsidiary [Member] | Level 3 [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [3]       0     0
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Carrying Amount [Member] | Sul Subsidiary [Member]              
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]              
Fair Value, Nonrecurring [2],[3]       $ 1,581,000,000     $ 1,581,000,000
Long Lived Assets Held And Used [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member] | DPL Subsidiary [Member]              
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items]              
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent           15.00%  
Fair Value Inputs, Discount Rate           7.00%  
Long Lived Assets Held And Used [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member] | buffalo gap II [Member] [Member]              
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items]              
Fair Value Inputs, Long-term Revenue Growth Rate            
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent            
Fair Value Inputs, Discount Rate            
Long Lived Assets Held And Used [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member] | Buffalo Gap [Member]              
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items]              
Fair Value Inputs, Long-term Revenue Growth Rate            
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent            
Fair Value Inputs, Discount Rate            
Long Lived Assets Held And Used [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member] | Energy Storage [Member]              
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items]              
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent           80.00%  
Fair Value Inputs, Discount Rate           9.00%  
Long Lived Assets Held And Used [Member] | Income Approach Valuation Technique [Member] | Maximum [Member] | DPL Subsidiary [Member]              
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items]              
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent           22.00%  
Long Lived Assets Held And Used [Member] | Income Approach Valuation Technique [Member] | Maximum [Member] | buffalo gap II [Member] [Member]              
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items]              
Fair Value Inputs, Long-term Revenue Growth Rate            
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent            
Long Lived Assets Held And Used [Member] | Income Approach Valuation Technique [Member] | Maximum [Member] | Buffalo Gap [Member]              
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items]              
Fair Value Inputs, Long-term Revenue Growth Rate            
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent            
Long Lived Assets Held And Used [Member] | Income Approach Valuation Technique [Member] | Maximum [Member] | Energy Storage [Member]              
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items]              
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent           85.00%  
Long Lived Assets Held And Used [Member] | Income Approach Valuation Technique [Member] | Minimum [Member] | DPL Subsidiary [Member]              
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items]              
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent           10.00%  
Long Lived Assets Held And Used [Member] | Income Approach Valuation Technique [Member] | Minimum [Member] | buffalo gap II [Member] [Member]              
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items]              
Fair Value Inputs, Long-term Revenue Growth Rate            
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent            
Long Lived Assets Held And Used [Member] | Income Approach Valuation Technique [Member] | Minimum [Member] | Buffalo Gap [Member]              
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items]              
Fair Value Inputs, Long-term Revenue Growth Rate            
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent            
Long Lived Assets Held And Used [Member] | Income Approach Valuation Technique [Member] | Minimum [Member] | Energy Storage [Member]              
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items]              
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent           46.00%  
[1] (3) Per the Company’s policy, pretax loss is limited to the impairment of long-lived assets. Any additional loss will be recognized on completion of the sale. See Note 16—Held-for-Sale Businesses and Dispositions for further information
[2] (1) Represents the carrying values at the dates of measurement, before fair value adjustment.
[3] (2) See Note 14—Asset Impairment Expense for further information.