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Fair Value (Nonrecurring Unobservable Inputs) (Details) - USD ($) | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Dec. 31, 2016 | Aug. 31, 2016 | Mar. 31, 2016
Buffalo Gap |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  | $ 36,000,000 |  |
buffalo gap II [Member] [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  |  |  | $ 92,000,000
Fair Value | Level 3 |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  | 320,000,000 |  |
Long Lived Assets Held And Used [Member] | Fair Value | Level 3 | Buffalo Gap |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1] |  |  | $ 36,000,000 |
Long Lived Assets Held And Used [Member] | Fair Value | Level 3 | DPL Subsidiary |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1],[2] | $ 89,000,000 | $ 103,000,000 |  |
Long Lived Assets Held And Used [Member] | Fair Value | Level 3 | buffalo gap II [Member] [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1] |  |  |  | $ 92,000,000
Income Approach Valuation Technique [Member] | Long Lived Assets Held And Used [Member] | Minimum | Buffalo Gap |  |  |  |  |
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 |  |  | (40.00%) |  |
Income Approach Valuation Technique [Member] | Long Lived Assets Held And Used [Member] | Minimum | DPL Subsidiary |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Inputs, Long-term Revenue Growth Rate |  | (11.00%) | (13.00%) |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  | (50.00%) | (42.00%) |  |
Fair Value Inputs, Discount Rate |  | 7.00% | 7.00% |  |
Income Approach Valuation Technique [Member] | Long Lived Assets Held And Used [Member] | Minimum | 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%) |  |
Income Approach Valuation Technique [Member] | Long Lived Assets Held And Used [Member] | Maximum | Buffalo Gap |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Inputs, Long-term Revenue Growth Rate |  |  | 9.00% |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  |  | 42.00% |  |
Income Approach Valuation Technique [Member] | Long Lived Assets Held And Used [Member] | Maximum | DPL Subsidiary |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Inputs, Long-term Revenue Growth Rate |  | 13.00% | (1.00%) |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  | 60.00% | 3.00% |  |
Fair Value Inputs, Discount Rate |  | 12.00% | 10.00% |  |
Income Approach Valuation Technique [Member] | Long Lived Assets Held And Used [Member] | Maximum | 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% |  |
Income Approach Valuation Technique [Member] | Long Lived Assets Held And Used [Member] | Weighted Average | Buffalo Gap |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Inputs, Long-term Revenue Growth Rate |  |  | (14.00%) |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  |  | 29.00% |  |
Fair Value Inputs, Discount Rate |  |  | 9.00% |  |
Income Approach Valuation Technique [Member] | Long Lived Assets Held And Used [Member] | Weighted Average | DPL Subsidiary |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Inputs, Long-term Revenue Growth Rate |  | 1.00% | (6.00%) |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  | 5.00% | (16.00%) |  |
Income Approach Valuation Technique [Member] | Long Lived Assets Held And Used [Member] | Weighted Average | 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% |  |
[1] | See Note 20—Asset Impairment Expense for further information.
[2] | See Note 20—Asset Impairment Expense for further discussion of each DPL impairment.

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