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v3.10.0.1

Fair Value (Nonrecurring Measurements) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges |  |  | $ 42,000,000 | $ 74,000,000 | $ 92,000,000 | $ 277,000,000 |  | $ 90,000,000 | $ 168,000,000 | $ 208,000,000 | $ 537,000,000 |  | $ 1,096,000,000
Other non-operating expense |  |  |  |  |  |  |  |  |  | 147,000,000 | 0 |  | 2,000,000
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  |  |  | (611,000,000) |  | $ (1,385,000,000)
Shady Point [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  | 30,000,000 |  |  |  |  |  |  | 30,000,000 |  |  |
Nejapa [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  | 5,000,000 |  |  |  |  |  |  | 5,000,000 |  |  |
Sul Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | $ 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |
Estimate of Fair Value Measurement [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  | 214,000,000 |  |  |  |  |  |  | 214,000,000 |  |  |
Long Lived Assets Held And Used [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [1] |  |  |  |  |  |  |  |  |  | 18,000,000 |  |
Long Lived Assets Held And Used [Member] | DPL Peaking Generation [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 5,000,000 |  |  |  | 2,000,000 |  |  |  |  | 2,000,000 |  |
Long Lived Assets Held And Used [Member] | Laurel Mountain [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [1] |  |  |  |  |  |  |  |  |  | 121,000,000 |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  | 33,000,000 |  |  |  |  |  |  | 33,000,000 |  |  |
Long Lived Assets Held And Used [Member] | Kilroot [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [1] |  |  |  |  |  |  |  |  |  | 37,000,000 |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  | 20,000,000 |  |  |  |  |  |  | 20,000,000 |  |  |
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 |  |
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 |  |  |  |  | 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 |  |  |  |  | 92,000,000 |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  |  |  |  | 0 |  |  |  |  | 0 |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  |  |  |  | 0 |  |  |  |  | 0 |  |
Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  |  |  |  | 0 |  |  |  |  | 0 |  |
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 Carrying Amount 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 Carrying Amount 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 Carrying Amount 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 Carrying Amount 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 Carrying Amount 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 Carrying Amount 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 Carrying Amount Disclosure Nonrecurring | [1] |  |  |  |  | 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 Carrying Amount Disclosure Nonrecurring | [1] |  |  |  |  | 0 |  |  |  |  | 0 |  |
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 Carrying Amount Disclosure Nonrecurring |  |  | 5,000,000 |  |  | 11,000,000 | [1] |  |  | 5,000,000 | 11,000,000 | [1] |
Long Lived Assets Held And Used [Member] | Reported Value Measurement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1],[2] |  |  |  |  | 18,000,000 |  |  |  |  | 18,000,000 |  |
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 Carrying Amount 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 Carrying Amount 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 Carrying Amount Disclosure Nonrecurring | [1],[2] |  |  |  |  | $ 77,000,000 |  |  |  |  | $ 77,000,000 |  |
Long Lived Assets Held For Sale [Member] | Shady Point [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [1] |  |  |  |  |  |  |  |  | 157,000,000 |  |  |
Long Lived Assets Held For Sale [Member] | Nejapa [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [1] |  |  |  |  |  |  |  |  | 37,000,000 |  |  |
Long Lived Assets Held For Sale [Member] | guacolda [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  | 209,000,000 |  |  |  |  |  |  | 209,000,000 |  |  |
Long Lived Assets Held For Sale [Member] | Elsta [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [1] |  |  |  |  |  |  |  |  | 3,000,000 |  |  |
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 | [1] |  |  |  |  |  |  |  |  | 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 | [1],[3] |  |  |  |  |  |  |  |  | 92,000,000 |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Shady Point [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  | 0 |  |  |  |  |  |  | 0 |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Shady Point [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  | 0 |  |  |  |  |  |  | 0 |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Shady Point [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  | 30,000,000 |  |  |  |  |  |  | 30,000,000 |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Nejapa [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  | 0 |  |  |  |  |  |  | 0 |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Nejapa [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  | 0 |  |  |  |  |  |  | 0 |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Nejapa [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  | 5,000,000 |  |  |  |  |  |  | 5,000,000 |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | guacolda [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  | 0 |  |  |  |  |  |  | 0 |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | guacolda [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  | 0 |  |  |  |  |  |  | 0 |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Elsta [Member] | Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  | 0 |  |  |  |  |  |  | 0 |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Elsta [Member] | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  | 16,000,000 |  |  |  |  |  |  | 16,000,000 |  |  |
Long Lived Assets Held For Sale [Member] | Estimate of Fair Value Measurement [Member] | Elsta [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  | 0 |  |  |  |  |  |  | 0 |  |  |
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 Carrying Amount 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 Carrying Amount 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 Carrying Amount 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 Carrying Amount Disclosure Nonrecurring | [1] |  | 0 |  |  |  |  |  |  | 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 Carrying Amount Disclosure Nonrecurring | [1] |  | 29,000,000 |  |  |  |  |  |  | 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 Carrying Amount Disclosure Nonrecurring | [1] |  | 0 |  |  |  |  |  |  | 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 Carrying Amount Disclosure Nonrecurring | [1] |  | 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 Carrying Amount Disclosure Nonrecurring | [1] |  | 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 Carrying Amount Disclosure Nonrecurring | [1] |  | 0 |  |  |  |  |  |  | 0 |  |  |
Long Lived Assets Held For Sale [Member] | Reported Value Measurement [Member] | Shady Point [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1],[2] |  | 211,000,000 |  |  |  |  |  |  | 211,000,000 |  |  |
Long Lived Assets Held For Sale [Member] | Reported Value Measurement [Member] | Nejapa [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1],[2] |  | 42,000,000 |  |  |  |  |  |  | 42,000,000 |  |  |
Long Lived Assets Held For Sale [Member] | Reported Value Measurement [Member] | guacolda [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1],[2] |  | 354,000,000 |  |  |  |  |  |  | 354,000,000 |  |  |
Long Lived Assets Held For Sale [Member] | Reported Value Measurement [Member] | Elsta [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1],[2] |  | 19,000,000 |  |  |  |  |  |  | 19,000,000 |  |  |
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 Carrying Amount 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 Carrying Amount Disclosure Nonrecurring | [1],[2] |  | 171,000,000 |  |  |  |  |  |  | 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 Carrying Amount Disclosure Nonrecurring | [1],[2] |  | $ 190,000,000 |  |  |  |  |  |  | $ 190,000,000 |  |  |
Discontinued Operations, Held-for-sale [Member] | Sul Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges |  | $ 783,000,000 |  |  |  |  |  |  |  |  |  |  |
[1] | See Note 20—Asset Impairment Expense for further information.
[2] | Represents the carrying values at the dates of initial measurement, before fair value adjustment.
[3] | Per the Company's policy, pre-tax loss is limited to the impairment of long-lived assets. Any additional loss will be recognized on completion of the sale. Upon disposal of Kazakhstan HPPs, the Company incurred an additional pre-tax loss on disposal of $33 million. See Note 20—Asset Impairment Expense and Note 23—Held-for-Sale and Dispositions for further information

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