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Asset Retirement Obligations (NDTF Information) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Asset Retirement Obligations [Line Items] |  |
Legally restricted NDTF investments, fair value | $ 6,102 | $ 5,579
Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Legally restricted NDTF investments, fair value | 3,443 | 3,133
Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Legally restricted NDTF investments, fair value | 2,659 | 2,446
Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Legally restricted NDTF investments, fair value | $ 2,659 | $ 2,446

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- Definition [Line Items] for Information and financial data about asset retirement obligations. + References No definition available. + Details
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- Definition Carrying amount of an asset that is legally restricted for purposes of settling an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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