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Fair Value (Nonrecurring Measurements) (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset Impairment Charges |  |  |  | $ 93 | $ 258
Other Asset Impairment Charges |  | $ 92 | $ 90 | 92 | 258
IPL Subsidiary [Member] | Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset Retirement Obligation |  | 32 |  | 32 |
Long Lived Assets Held And Used [Member] | DPL Subsidiary [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Asset Impairment Charges | [1] |  |  |  | 66
Long Lived Assets Held And Used [Member] | DPL Subsidiary [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Asset Impairment Charges | [1] |  |  | 83 |
Long Lived Assets Held And Used [Member] | Other Subsidiaries [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Asset Impairment Charges | [1] |  |  |  | 8
Long Lived Assets Held And Used [Member] | Kazakhstan Hydro [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Asset Impairment Charges | [1] |  |  |  | 90
Long Lived Assets Held And Used [Member] | Kazakhstan [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Asset Impairment Charges | [1] |  |  |  | 94
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | DPL Subsidiary [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring |  | 127 |  | 127 |
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Fair Value [Member] | DPL Subsidiary [Member] | Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1] |  | 0 |  | 0
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Fair Value [Member] | DPL Subsidiary [Member] | Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1] |  | 0 |  | 0
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Fair Value [Member] | DPL Subsidiary [Member] | Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1] |  | 11 |  | 11
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Fair Value [Member] | DPL Subsidiary [Member] | Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1] | 0 |  | 0 |
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Fair Value [Member] | DPL Subsidiary [Member] | Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1] | 0 |  | 0 |
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Fair Value [Member] | DPL Subsidiary [Member] | Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1] | 127 |  | 127 |
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Subsidiaries [Member] | Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1] |  | 0 |  | 0
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Subsidiaries [Member] | Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1] |  | 0 |  | 0
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Fair Value [Member] | Other Subsidiaries [Member] | Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1] |  | 7 |  | 7
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Fair Value [Member] | Kazakhstan Hydro [Member] | Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1] |  | 0 |  | 0
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Fair Value [Member] | Kazakhstan Hydro [Member] | Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1] |  | 92 |  | 92
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Fair Value [Member] | Kazakhstan Hydro [Member] | Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1] |  | 0 |  | 0
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Fair Value [Member] | Kazakhstan [Member] | Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1] |  | 0 |  | 0
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Fair Value [Member] | Kazakhstan [Member] | Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1] |  | 29 |  | 29
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Fair Value [Member] | Kazakhstan [Member] | Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1] |  | 0 |  | 0
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | DPL Subsidiary [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1],[2] |  | 77 |  | 77
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | DPL Subsidiary [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1],[2] | $ 210 |  | $ 210 |
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | Other Subsidiaries [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1],[2] |  | 15 |  | 15
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | Kazakhstan Hydro [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1],[2] |  | 190 |  | 190
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Carrying Amount [Member] | Kazakhstan [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Nonrecurring | [1],[2] |  | $ 171 |  | $ 171
Measurement Input, Long-term Revenue Growth Rate [Member] | Long Lived Assets Held And Used [Member] | Valuation, Income Approach [Member] | Weighted Average [Member] | DPL Subsidiary [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  |  |  | (1.50%) |
Measurement Input, Long-term Revenue Growth Rate [Member] | Long Lived Assets Held And Used [Member] | Valuation, Income Approach [Member] | Maximum [Member] | DPL Subsidiary [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  |  |  | (3.00%) |
Measurement Input, Long-term Revenue Growth Rate [Member] | Long Lived Assets Held And Used [Member] | Valuation, Income Approach [Member] | Minimum [Member] | DPL Subsidiary [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  |  |  | (1.00%) |
Measurement Input, Operating Margin [Member] | Long Lived Assets Held And Used [Member] | Valuation, Income Approach [Member] | Weighted Average [Member] | DPL Subsidiary [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  |  |  | 30.00% |
Measurement Input, Operating Margin [Member] | Long Lived Assets Held And Used [Member] | Valuation, Income Approach [Member] | Maximum [Member] | DPL Subsidiary [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  |  |  | 36.00% |
Measurement Input, Operating Margin [Member] | Long Lived Assets Held And Used [Member] | Valuation, Income Approach [Member] | Minimum [Member] | DPL Subsidiary [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  |  |  | 25.00% |
Measurement Input, Discount Rate [Member] | Long Lived Assets Held And Used [Member] | Valuation, Income Approach [Member] | Weighted Average [Member] | DPL Subsidiary [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  |  |  | 9.00% |
Interest Rate Contract [Member] | Measurement Input, Entity Credit Risk [Member] | Weighted Average [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  |  |  | 3.61% |
Interest Rate Contract [Member] | Measurement Input, Entity Credit Risk [Member] | Maximum [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  |  |  | 4.38% |
Interest Rate Contract [Member] | Measurement Input, Entity Credit Risk [Member] | Minimum [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  |  |  | 2.38% |
Argentina, Pesos | Foreign Exchange Contract [Member] | Weighted Average [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
U S Dollar Indexation In Argentina |  | 62.0 |  | 62.0 |
Argentina, Pesos | Foreign Exchange Contract [Member] | Maximum [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
U S Dollar Indexation In Argentina |  | 87.4 |  | 87.4 |
Argentina, Pesos | Foreign Exchange Contract [Member] | Minimum [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
U S Dollar Indexation In Argentina |  | 36.9 |  | 36.9 |
[1] | .(2) See Note 14—Asset Impairment Expense for further informatio
[2] | _(1) Represents the carrying values at the dates of measurement, before fair value adjustmen

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