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Fair Value (Nonrecurring Measurements) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jun. 30, 2016
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Asset Impairment Charges |  | $ 0 | $ 168 |
Other Asset Impairment Charges |  | $ 0 | 168 |
Long Lived Assets Held And Used [Member] | DPL Subsidiary [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Other Asset Impairment Charges | [1] |  | 66 |
Long Lived Assets Held And Used [Member] | Other Subsidiaries [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Other Asset Impairment Charges | [1] |  | 8 |
Long Lived Assets Held And Used [Member] | Kazakhstan [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Other Asset Impairment Charges | [1] |  | $ 94 |
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 | [1] |  |  | $ 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 | [1] |  |  | 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 | [1] |  |  | 11
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Subsidiaries [Member] | Level 1 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | [1] |  |  | 0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Subsidiaries [Member] | Level 2 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | [1] |  |  | 0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Subsidiaries [Member] | Level 3 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | [1] |  |  | 7
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Kazakhstan [Member] | Level 1 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | [1] |  |  | 0
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Kazakhstan [Member] | Level 2 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | [1] |  |  | 29
Long Lived Assets Held And Used [Member] | Fair Value [Member] | Kazakhstan [Member] | Level 3 [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | [1] |  |  | 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 | [1],[2] |  |  | 77
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | Other Subsidiaries [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | [1],[2] |  |  | 15
Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | Kazakhstan [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Fair Value, Nonrecurring | [1],[2] |  |  | $ 171
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations [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 Revenue Growth Rate |  | 26.00% |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  | (10.00%) |  |
Fair Value Inputs, Discount Rate |  | 17.00% |  |
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations [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 Revenue Growth Rate |  | 110.00% |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  | (11.00%) |  |
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations [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 Revenue Growth Rate |  | 3.00% |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  | (22.00%) |  |
[1] | (2) See Note 14—Asset Impairment Expense for further information.
[2] | (1) Represents the carrying values at the dates of measurement, before fair value adjustment.

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