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Variable Interest Entities (Receivables Sold) (Details) - Variable Interest Entity, Not Primary Beneficiary [Member] - Cinergy Receivables [Member] - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Duke Energy Ohio [Member] |  |
Variable Interest Entity [Line Items] |  |
Receivables sold | $ 269 | $ 273
Less: retained interests | 93 | 87
Net receivables sold | 176 | 186
Duke Energy Indiana [Member] |  |
Variable Interest Entity [Line Items] |  |
Receivables sold | 336 | 312
Less: retained interests | 118 | 106
Net receivables sold | $ 218 | $ 206

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- Definition Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107314-111719 + Details
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