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Asset Impairment Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Asset Impairment Expense [Line Items] |  |  |
Impairment of Long-Lived Assets Held-for-use | $ 0 | $ 168 |
Alto Maipo [Member] |  |  |
Asset Impairment Expense [Line Items] |  |  |
Assets Carrying Amount Disclosure Nonrecurring | $ 1,500 |  |
Kazakhstan [Member] |  |  |
Asset Impairment Expense [Line Items] |  |  |
Impairment of Long-Lived Assets to be Disposed of |  | 94 |
DPL Subsidiary [Member] |  |  |
Asset Impairment Expense [Line Items] |  |  |
Impairment of Long-Lived Assets Held-for-use |  | 66 |
Other Impairment [Member] |  |  |
Asset Impairment Expense [Line Items] |  |  |
Impairment of Long-Lived Assets Held-for-use |  | 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
Long Lived Assets Held And Used [Member] | Stuart Station [Member] |  |  |
Asset Impairment Expense [Line Items] |  |  |
Assets, fair value |  | 3 |
Long Lived Assets Held And Used [Member] | Killen Station [Member] |  |  |
Asset Impairment Expense [Line Items] |  |  |
Assets, fair value |  | $ 8 |

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- Definition 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. + References No definition available. + Details
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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 No definition available. + Details
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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 on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32211-110900 + Details
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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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84241808&loc=d3e92212-112881 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2611-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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