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Asset Impairment Expense (Impairment of Long-Lived Assets Held and Used by Asset) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Asset impairment expense | $ (69) | $ (116) | $ (42) | $ (74) | $ (92) | $ (185) | $ (208) | $ (537)
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  | 185 | 208 | 537
Kilroot and Ballylumford [Member] |  |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  | 115 | 0 | 37
Hawaii Subsidiary [Member] |  |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  | 60 | 0 | 0
Shady Point [Member] |  |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  | 0 | 157 | 0
Nejapa [Member] |  |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  | 0 | 37 | 0
DPL Subsidiary [Member] |  |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  | 0 | 0 | 175
Laurel Mountain [Member] |  |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  | 0 | 0 | 121
Kazakhstan Hydro [Member] |  |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  |  |  | 0 | 0 | 92
Kazakhstan [Member] |  |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  |  |  | 0 | 0 | 94
Other |  |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  | $ 10 | $ 14 | $ 18

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