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Fair Value (Nonrecurring Measurements) (Details) - USD ($) | 2 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2017 | Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2016
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  |  |  | $ 260,000,000 | $ 475,000,000 |  |
Other Asset Impairment Charges |  |  |  | $ 2,000,000 |  | $ 79,000,000 |  | 260,000,000 | 473,000,000 |  |
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 |  |  | 92,000,000 |  |  |
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] | Buffalo Gap [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [3] |  |  |  |  |  |  |  | 78,000,000 |  |
Long Lived Assets Held And Used [Member] | Buffalo Gap [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Nonrecurring | [3] |  |  | 35,000,000 |  |  |  | 35,000,000 |  |  |
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 |
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] | 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 |
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] | Buffalo Gap [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 [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 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 |  | $ 77,000,000 | [2],[3] |  |  | $ 113,000,000 |  |  | 113,000,000 | 324,000,000 | [2],[3]
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 |
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 |
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 |
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 |
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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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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