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Fair Value (Nonrecurring Measurements) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 02, 2015 | Feb. 09, 2015 | Dec. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Aug. 31, 2016 | Aug. 28, 2015 | Sep. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Oct. 01, 2015
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,096,000,000 | $ 285,000,000 | $ 91,000,000 |
Goodwill impairment expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 317,000,000 | 164,000,000 |
Other non-operating expense |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 | 0 | 128,000,000 |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (51,000,000) |
Kilroot [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  |  |  |  |  |  |  |  |  | $ 70,000,000 |  |  |  |  |
Other Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 121,000,000 | 0 |
UK Wind Development Projects [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |
Other Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,000,000 |  |
DPL Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges |  |  |  | $ 624,000,000 | $ 235,000,000 |  |  |  |  |  |  |  | 859,000,000 | 0 | 0 |
Goodwill impairment expense |  |  |  |  |  |  | $ 317,000,000 |  |  |  |  |  |  |  |  |
buffalo gap II [Member] [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  |  |  |  | $ 92,000,000 |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  |  |  | 159,000,000 | 0 | 0 |
buffalo gap III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  |  |  |  |  |  |  |  |  |  | $ 118,000,000 |  |  |  |
Other Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 116,000,000 | 0 |
Sul Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  | 602,000,000 |  |  |  |  |  |  |  |  | (1,385,000,000) |  |  |
Buffalo Gap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  |  | 36,000,000 |  |  |  |  |  |  |  |  | 36,000,000 |  |  |
Other Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  |  |  | 77,000,000 | 0 | $ 0 |
Estimate of Fair Value Measurement [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  |  | 320,000,000 |  |  |  |  |  |  |  |  | 320,000,000 |  |  |
Equity Method Investments [Member] | Solar Spain [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-operating expense | [1] |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments [Member] | Estimate of Fair Value Measurement [Member] | Solar Spain [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1] |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments [Member] | Estimate of Fair Value Measurement [Member] | Solar Spain [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1] |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments [Member] | Estimate of Fair Value Measurement [Member] | Solar Spain [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1] |  | 29,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments [Member] | Reported Value Measurement [Member] | Solar Spain [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1],[2] |  | $ 29,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Sale [Member] | Sul Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax | [3] |  |  |  |  |  |  | $ (783,000,000) |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Sale [Member] | Estimate of Fair Value Measurement [Member] | Sul Subsidiary [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [3] |  |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Sale [Member] | Estimate of Fair Value Measurement [Member] | Sul Subsidiary [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [3] |  |  |  | 470,000,000 |  |  | 470,000,000 |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Sale [Member] | Estimate of Fair Value Measurement [Member] | Sul Subsidiary [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [3] |  |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Sale [Member] | Reported Value Measurement [Member] | Sul Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [2],[3] |  |  |  | 1,581,000,000 |  |  | 1,581,000,000 |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Kilroot [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [4] |  |  |  |  |  |  |  |  |  | 121,000,000 |  |  |  |  |
Long Lived Assets Held And Used [Member] | Other Entities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [4] |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 |  |
Long Lived Assets Held And Used [Member] | UK Wind Development Projects [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [4] |  |  |  |  |  |  |  | 37,000,000 |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | DPL Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [4] |  |  |  |  |  |  | 235,000,000 |  |  |  |  | 624,000,000 |  |  |
Long Lived Assets Held And Used [Member] | buffalo gap II [Member] [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [4] |  |  |  |  | 159,000,000 |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | buffalo gap III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [4] |  |  |  |  |  |  |  |  |  |  | 116,000,000 |  |  |  |
Long Lived Assets Held And Used [Member] | Buffalo Gap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [4] |  |  |  |  |  |  |  |  | $ 77,000,000 |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Kilroot [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Kilroot [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Kilroot [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  |  |  |  |  |  | 70,000,000 |  |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Other Entities [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Other Entities [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  |  | 21,000,000 |  |  |  |  |  |  | 21,000,000 |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Other Entities [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  |  | $ 0 |  |  |  |  |  |  | $ 0 |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | UK Wind Development Projects [Domain] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | UK Wind Development Projects [Domain] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | UK Wind Development Projects [Domain] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | DPL Subsidiary | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  | 0 | 0 |  |  | 0 |  |  |  |  | 0 |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | DPL Subsidiary | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  | 60,000,000 | 0 |  |  | 0 |  |  |  |  | 60,000,000 |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | DPL Subsidiary | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4],[5] |  |  | 103,000,000 | 89,000,000 |  |  | 89,000,000 |  |  |  |  | 103,000,000 |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | buffalo gap II [Member] [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | buffalo gap II [Member] [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | buffalo gap II [Member] [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  | 92,000,000 |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | buffalo gap III [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | buffalo gap III [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | buffalo gap III [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  |  |  |  |  |  |  | 118,000,000 |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Buffalo Gap | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Buffalo Gap | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Buffalo Gap | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [4] |  |  |  |  |  |  |  |  | 36,000,000 |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Reported Value Measurement [Member] | Kilroot [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [2],[4] |  |  |  |  |  |  |  |  |  | $ 191,000,000 |  |  |  |  |
Long Lived Assets Held And Used [Member] | Reported Value Measurement [Member] | Other Entities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [2],[4] |  |  |  |  |  |  |  |  |  |  | 32,000,000 |  |  |  |
Long Lived Assets Held And Used [Member] | Reported Value Measurement [Member] | UK Wind Development Projects [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [2],[4] |  |  |  |  |  |  |  | $ 38,000,000 |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Reported Value Measurement [Member] | DPL Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [2],[4] |  |  | $ 787,000,000 | $ 324,000,000 |  |  | $ 324,000,000 |  |  |  |  | $ 787,000,000 |  |  |
Long Lived Assets Held And Used [Member] | Reported Value Measurement [Member] | buffalo gap II [Member] [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [2],[4] |  |  |  |  | $ 251,000,000 |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Reported Value Measurement [Member] | buffalo gap III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [2],[4] |  |  |  |  |  |  |  |  |  |  | $ 234,000,000 |  |  |  |
Long Lived Assets Held And Used [Member] | Reported Value Measurement [Member] | Buffalo Gap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [2],[4] |  |  |  |  |  |  |  |  | $ 113,000,000 |  |  |  |  |  |
Goodwill [Member] | DP&L [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment expense | [6] | $ 317,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Member] | Estimate of Fair Value Measurement [Member] | DP&L [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0
Goodwill [Member] | Estimate of Fair Value Measurement [Member] | DP&L [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Goodwill [Member] | Estimate of Fair Value Measurement [Member] | DP&L [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Goodwill [Member] | Reported Value Measurement [Member] | DP&L [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [2],[6] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 317,000,000
[1] | See Note 7—Investments In and Advances to Affiliates for further information.
[2] | Represents the carrying values at the dates of measurement, before fair value adjustment.
[3] | Per the Company's policy, pre-tax loss was limited to the impairment of long-lived assets. Upon disposal of AES Sul, we incurred an additional pre-tax loss on sale of $602 million. See Note 22—Discontinued Operations for further information.
[4] | See Note 20—Asset Impairment Expense for further information.
[5] | See Note 20—Asset Impairment Expense for further discussion of each DPL impairment.
[6] | See Note 9—Goodwill and Other Intangible Assets for further information.

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