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Asset Impairment Expense (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Asset Impairment Expense [Line Items]
Impairment of Long-Lived Assets Held-for-use	$ 92	$ 90		$ 92	$ 258
US Generation Facility [Member]
Asset Impairment Expense [Line Items]
Impairment of Long-Lived Assets Held-for-use	83	0		83	0
Kazakhstan Hydro [Member]
Asset Impairment Expense [Line Items]
Impairment of Long-Lived Assets to be Disposed of	0	90		0	90
Kazakhstan [Member]
Asset Impairment Expense [Line Items]
Impairment of Long-Lived Assets to be Disposed of	0	0		0	94
DPL Subsidiary [Member]
Asset Impairment Expense [Line Items]
Impairment of Long-Lived Assets Held-for-use	0	0		0	66
Other Subsidiaries [Member]
Asset Impairment Expense [Line Items]
Impairment of Long-Lived Assets Held-for-use	9	0		9	8
Long Lived Assets Held For Sale [Member] | Kazakhstan [Member]
Asset Impairment Expense [Line Items]
Assets Carrying Amount Disclosure Nonrecurring			$ 171
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)			92
Fair Value Less Costs To Sell			29
Impairment of Long-Lived Assets to be Disposed of			$ 94
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | US Generation Facility [Member]
Asset Impairment Expense [Line Items]
Assets, fair value	$ 127			$ 127
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Stuart Station [Member]
Asset Impairment Expense [Line Items]
Assets, fair value		3			3
Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets Held And Used [Member] | Killen Station [Member]
Asset Impairment Expense [Line Items]
Assets, fair value		$ 8			$ 8

X

- Definition

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+ References

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This element represents the aggregate carrying amount of the assets measured at fair value on a nonrecurring basis by the entity before the recognition of impairment charges.

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value less costs to sell by the entity.

+ References

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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Amount of foreign currency translation gain (loss) in the disposal group, including discontinued operation, recognized in the statement of income as a result of the sale or complete or substantially complete liquidation of an investment in a foreign entity.

+ References

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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