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Fair Value (Nonrecurring Measurements) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Mar. 31, 2016 | Feb. 09, 2015
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  | $ 396,000,000 | $ 45,000,000 |  |
Other Asset Impairment Charges |  | $ 235,000,000 | $ 37,000,000 | 394,000,000 | 45,000,000 |  |
UK Wind Projects [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |
Fair Value, Nonrecurring |  |  | 1,000,000 |  | 1,000,000 |  |
Discontinued operations and held for sale businesses [Member] | Sul Subsidiary [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |
Other Asset Impairment Charges | [1] |  |  | 783,000,000 |  |  |
Discontinued operations and held for sale businesses [Member] | Fair Value [Member] | Sul Subsidiary [Member] | Level 1 [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] | 0 |  | 0 |  |  |
Discontinued operations and held for sale businesses [Member] | Fair Value [Member] | Sul Subsidiary [Member] | Level 2 [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1] | 470,000,000 |  | 470,000,000 |  |  |
Discontinued operations and held for sale businesses [Member] | Carrying Amount [Member] | Sul Subsidiary [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |
Fair Value, Nonrecurring | [1],[2] | 1,581,000,000 |  | 1,581,000,000 |  |  |
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] |  |  | 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] | UK Wind Projects [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |
Asset Impairment Charges | [3] |  |  |  | 37,000,000 |  |
Long Lived Assets Held And Used [Member] | Other Entity [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 |  |  |
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 |  |  |
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] | UK Wind Projects [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] | UK Wind Projects [Member] | Level 2 [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |
Fair Value, Nonrecurring | [3] |  | 1,000,000 |  | 1,000,000 |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | UK Wind Projects [Member] | Level 3 [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] | Other Entity [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] | Other Entity [Member] | Level 2 [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |
Fair Value, Nonrecurring | [3] |  | 21,000,000 |  | 21,000,000 |  |
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Entity [Member] | Level 3 [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |
Fair Value, Nonrecurring | [3] |  | 0 |  | 0 |  |
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] | 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] | UK Wind Projects [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |
Fair Value, Nonrecurring | [2],[3] |  | 38,000,000 |  | 38,000,000 |  |
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | Other Entity [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |
Fair Value, Nonrecurring | [2],[3] |  | $ 29,000,000 |  | 29,000,000 |  |
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] | Solar Spain [Member] | Level 1 [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |
Fair Value, Nonrecurring |  |  |  |  |  |  | $ 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
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
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
Discontinued Operations, Held-for-sale [Member] | Discontinued operations and held for sale businesses [Member] | Fair Value [Member] | Sul Subsidiary [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] | buffalo gap II [Member] [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] | DPL Subsidiary [Member] | Level 3 [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |
Fair Value, Nonrecurring | [3] | 89,000,000 |  | 89,000,000 |  |  |
Long Lived Assets Held And Used [Member] | 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 |  | 89,000,000 |  | 89,000,000 |  |  |
Long Lived Assets Held And Used [Member] | 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 |  | $ 92,000,000 |  | $ 92,000,000 |  |  |
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 Revenue Growth Rate |  |  |  | (10.00%) |  |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  |  |  | (5.00%) |  |  |
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 |  |  |  | 20.00% |  |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  |  |  | 18.00% |  |  |
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 Revenue Growth Rate |  |  |  | 13.00% |  |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  |  |  | 60.00% |  |  |
Fair Value Inputs, Discount Rate |  |  |  | 12.00% |  |  |
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 |  |  |  | 21.00% |  |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  |  |  | 48.00% |  |  |
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 Revenue Growth Rate |  |  |  | (11.00%) |  |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  |  |  | (50.00%) |  |  |
Fair Value Inputs, Discount Rate |  |  |  | (7.00%) |  |  |
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 |  |  |  | (17.00%) |  |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  |  |  | (166.00%) |  |  |
[1] | (3) Per the Company’s policy, pre-tax loss is limited to the impairment of long-lived assets. Any additional loss will be recognized on completion of the sale. See Note 15—Discontinued Operations and Held-for-Sale Businesses for further information.
[2] | (1) Represents the carrying values at the dates of measurement, before fair value adjustment.
[3] | See Note 13—Asset Impairment Expense for further information.

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