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Fair Value (Nonrecurring Measurements) (Details) - USD ($) | 2 Months Ended | 3 Months Ended | 6 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 28, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2017 | Jun. 30, 2016 | Aug. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 537,000,000 | $ 1,096,000,000 | $ 285,000,000
Goodwill impairment expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 317,000,000
Other non-operating expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (611,000,000) | (1,385,000,000) | 0
Impairment Expense Pre Tax Total |  |  | $ 277,000,000 | $ 2,000,000 | $ 90,000,000 | $ 168,000,000 | $ 623,000,000 | $ 79,000,000 | $ 235,000,000 | $ 159,000,000 |  |  |  |  |  |  |
DPL Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment expense |  |  |  |  |  |  |  |  |  |  | $ 317,000,000 |  |  |  |  |  |
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 |  |  |  |
Estimate of Fair Value Measurement [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  | 64,000,000 |  |  |  |  |  |  |  |  |  |  |  | 64,000,000 |  |
Long Lived Assets Held And Used [Member] | DPL Peaking Generation [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  |  |  |  |  | 2,000,000 |  | 5,000,000 |  |  |  | 5,000,000 |  |  | 2,000,000 |
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 |  |  |  |  |  |  |  |  |  |  |  | 33,000,000 |  |
Other Asset Impairment Charges | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | 121,000,000 |  |
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 |  |  |  | 20,000,000 |  | $ 70,000,000
Other Asset Impairment Charges | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 | [1] | $ 66,000,000 |  |  |  |  |  |  |  |  |  |  | 235,000,000 |  |  | 624,000,000 |
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 |  |  |  |  |  |  |  |  | 36,000,000 |
Other Asset Impairment Charges | [1] |  |  |  |  |  |  |  |  |  |  |  |  | $ 77,000,000 |  |  |
Long Lived Assets Held And Used [Member] | Other Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000,000 |  |
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 |  |  |  |  |  |  |  |  | 92,000,000 |
Other Asset Impairment Charges | [1] |  |  |  |  |  |  |  |  | 159,000,000 |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Laurel Mountain [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1] |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Laurel Mountain [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1] |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Laurel Mountain [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1] |  | 33,000,000 |  |  |  |  |  |  |  |  |  |  |  | 33,000,000 |  |
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 | [1] |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 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 | [1] |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 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 | [1] |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |
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 | [1] | 0 |  |  |  |  | 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 | [1] | 0 |  |  |  |  | 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 | [1] | 11,000,000 |  |  |  |  | 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 [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1] |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Buffalo Gap [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1] |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Buffalo Gap [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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] | Estimate of Fair Value Measurement [Member] | Other Subsidiaries [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Other Subsidiaries [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Other Subsidiaries [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
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 | [1] |  |  |  |  |  |  |  |  | 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 | [1] |  |  |  |  |  |  |  |  | 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 | [1] |  |  |  |  |  |  |  |  | 92,000,000 |  |  |  |  |  |  |
Long Lived Assets Held And Used [Member] | Reported Value Measurement [Member] | Laurel Mountain [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1],[2] |  | 154,000,000 |  |  |  |  |  |  |  |  |  |  |  | 154,000,000 |  |
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 | [1],[2] |  | 69,000,000 |  |  |  |  |  |  |  |  |  |  |  | 69,000,000 |  |
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 | [1],[2] | $ 77,000,000 |  |  |  |  | $ 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 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1],[2] |  |  |  |  |  |  |  |  |  |  |  |  | $ 113,000,000 |  |  |
Long Lived Assets Held And Used [Member] | Reported Value Measurement [Member] | Other Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  | 18,000,000 |  |  |  |  |  |  |  |  |  |  |  | 18,000,000 |  |
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 | [1],[2] |  |  |  |  |  |  |  |  | $ 251,000,000 |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Member] | DPL Peaking Generation [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | 109,000,000 |  |
Long Lived Assets Held For Sale [Member] | Kazakhstan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges |  |  |  |  |  | 94,000,000 |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Member] | Kazakhstan Hydro [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  |  | $ 92,000,000 |  |  |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | DPL Peaking Generation [Domain] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1] |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | DPL Peaking Generation [Domain] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1] |  | 237,000,000 |  |  |  |  |  |  |  |  |  |  |  | 237,000,000 |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | DPL Peaking Generation [Domain] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1] |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Kazakhstan [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Kazakhstan [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  |  |  |  | 29,000,000 |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Kazakhstan [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Kazakhstan Hydro [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  |  |  | 0 |  |  |  |  |  |  | 0 |  |  |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Kazakhstan Hydro [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  |  |  | 92,000,000 |  |  |  |  |  |  | 92,000,000 |  |  |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Kazakhstan Hydro [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  |  |  | 0 |  |  |  |  |  |  | 0 |  |  |  |  |
Long Lived Assets Held For 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 |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  |  |  |
Long Lived Assets Held For 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 |  |  |  |  |  |  |  |  | 470,000,000 |  |  |  | 470,000,000 |  |  |  |
Long Lived Assets Held For 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 |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  |  |  |
Long Lived Assets Held For Sale [Member] | Reported Value Measurement [Member] | DPL Peaking Generation [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | [1],[2] |  | $ 346,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 346,000,000 |  |
Long Lived Assets Held For Sale [Member] | Reported Value Measurement [Member] | Kazakhstan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  |  |  |  | $ 171,000,000 |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Member] | Reported Value Measurement [Member] | Kazakhstan Hydro [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  |  |  | $ 190,000,000 |  |  |  |  |  |  | 190,000,000 |  |  |  |  |
Long Lived Assets Held For 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 |  |  |  |  |  |  |  |  | $ 1,581,000,000 |  |  |  | $ 1,581,000,000 |  |  |  |
Discontinued Operations, Held-for-sale [Member] | Sul Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [1] |  |  |  |  |  |  |  |  |  |  | $ 783,000,000 |  |  |  |  |
[1] | See Note 19—Asset Impairment Expense for further information.
[2] | Represents the carrying values at the dates of measurement, before fair value adjustment.

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