XML 121 R83.htm IDEA: XBRL DOCUMENT
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Fair Value (Nonrecurring Unobservable Inputs) (Details) - USD ($) | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Feb. 28, 2017 | Dec. 31, 2016 | Aug. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015
Fair Value | Level 3 |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  | $ 64,000,000 |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Laurel Mountain [Member] |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  | 33,000,000 |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Buffalo Gap [Member] |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |
Assets, Fair Value 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, Fair Value Disclosure, Nonrecurring |  |  |  | 92,000,000 |  |  |  |
Long Lived Assets Held And Used [Member] | Kilroot [Member] |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  | 20,000,000 |  |  |  |  |  | $ 70,000,000
Long Lived Assets Held And Used [Member] | Fair Value | Level 3 | Laurel Mountain [Member] |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1] | 33,000,000 |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | Level 3 | Buffalo Gap [Member] |  |  |  |  |  |  |  |
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] |  | $ 11,000,000 | $ 103,000,000 |  | $ 89,000,000 |  |
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 |
Long Lived Assets Held And Used [Member] | Fair Value | Level 3 | Kilroot [Member] |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1] | $ 20,000,000 |  |  |  |  |  |
Income Approach Valuation Technique [Member] | Long Lived Assets Held And Used [Member] | Minimum | Laurel Mountain [Member] |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |
Fair Value Inputs, Long-term Revenue Growth Rate |  | (30.00%) |  |  |  |  |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  | (61.00%) |  |  |  |  |  |
Fair Value Inputs, Discount Rate |  | 0.00% |  |  |  |  |  |
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 |  | (0.00%) |  |  |  |  |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  | (0.00%) |  |  |  |  |  |
Income Approach Valuation Technique [Member] | Long Lived Assets Held And Used [Member] | Minimum | Kilroot [Member] |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |
Fair Value Inputs, Long-term Revenue Growth Rate |  | (85.00%) |  |  |  |  |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  | (31.80%) |  |  |  |  |  |
Income Approach Valuation Technique [Member] | Long Lived Assets Held And Used [Member] | Maximum | Laurel Mountain [Member] |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |
Fair Value Inputs, Long-term Revenue Growth Rate |  | (2.00%) |  |  |  |  |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  | (73.00%) |  |  |  |  |  |
Fair Value Inputs, Discount Rate |  | 0.00% |  |  |  |  |  |
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 |  | (0.00%) |  |  |  |  |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  | (0.00%) |  |  |  |  |  |
Income Approach Valuation Technique [Member] | Long Lived Assets Held And Used [Member] | Maximum | Kilroot [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 |  | (28.00%) |  |  |  |  |  |
Income Approach Valuation Technique [Member] | Long Lived Assets Held And Used [Member] | Weighted Average | Laurel Mountain [Member] |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |
Fair Value Inputs, Long-term Revenue Growth Rate |  | (0.00%) |  |  |  |  |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  | (64.00%) |  |  |  |  |  |
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, Discount Rate |  | 7.00% |  |  |  |  |  |
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 |  | (0.00%) |  |  |  |  |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  | (0.00%) |  |  |  |  |  |
Fair Value Inputs, Discount Rate |  | 0.00% |  |  |  |  |  |
Income Approach Valuation Technique [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 Inputs, Long-term Revenue Growth Rate |  | (16.00%) |  |  |  |  |  |
Fair Value Inputs, Long-term Pre-tax Operating Margin, Percent |  | (6.00%) |  |  |  |  |  |
Fair Value Inputs, Discount Rate |  | 8.00% |  |  |  |  |  |
[1] | See Note 19—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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