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Fair Value (Nonrecurring Measurements) (Details) - USD ($) | 2 Months Ended | 3 Months Ended
--- | --- | ---
Feb. 28, 2017 | Mar. 31, 2017 | Mar. 31, 2016
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |
Asset Impairment Charges |  |  | $ 168,000,000 | $ 161,000,000
Other Asset Impairment Charges |  |  | 168,000,000 | 159,000,000
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 |
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 |
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] |  | 29,000,000 |
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 |
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] |  | 171,000,000 |
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 |  |
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 |  |
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 |  |
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 |  |
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 |
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 |
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 |
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 |  |
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 |
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.

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