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Fair Value (Nonrecurring Unobservable Inputs) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets Liabilities Value |  | $ 63,000,000 |
Laurel Mountain [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 30,000,000 |
Kilroot [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 5,000,000 |
Fair Value | Level 3 |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | $ 214,000,000 |
Long Lived Assets Held And Used [Member] | Buffalo Gap [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  | $ 36,000,000
Long Lived Assets Held And Used [Member] | buffalo gap II [Member] [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  | 92,000,000
Long Lived Assets Held And Used [Member] | Fair Value | Level 3 |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  | $ 0
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Minimum | DPL Subsidiary |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | (70.00%) |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Minimum | Kilroot [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | (70.00%) |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Maximum | DPL Subsidiary |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 467.00% |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Maximum | Kilroot [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | (1.00%) |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [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 Measurement Inputs, Nonrecurring |  | 48.00% |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Weighted Average | Kilroot [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | (15.00%) |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Minimum | DPL Subsidiary |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 0.00% |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Minimum | Kilroot [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 37.00% |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Maximum | DPL Subsidiary |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 0.00% |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Maximum | Kilroot [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 82.00% |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [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 Measurement Inputs, Nonrecurring |  | 0.00% |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Weighted Average | Kilroot [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 59.00% |
Measurement Input, Discount Rate [Member] | Valuation, Income Approach [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 Measurement Inputs, Nonrecurring |  | 10.00% |
Measurement Input, Discount Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Weighted Average | Kilroot [Member] |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 12.00% |
[1] | See Note 20—Asset Impairment Expense for further information.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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