v2.4.0.8

Variable Interest Entities (Fair Value Assumptions)(Details) (Cinergy Receivables [Member]) | 9 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Duke Energy Ohio [Member] |  |
Variable Interest Entities [Line Items] |  |
Anticipated credit loss ratio | 0.60% | 0.60%
Discount rate | 1.20% | 1.20%
Receivable turnover rate | 12.80% | 12.80%
Duke Energy Indiana [Member] |  |
Variable Interest Entities [Line Items] |  |
Anticipated credit loss ratio | 0.30% | 0.30%
Discount rate | 1.20% | 1.20%
Receivable turnover rate | 10.50% | 10.30%

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- Definition The ratio of total receivables to total monthly billings, as related to total receivables. + References No definition available. + Details
Name: | duk_ReceivableTurnoverRate
Namespace Prefix: | duk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Discount rate which is used to value residual cash flows generated by financial assets of a securitization, asset-backed financing arrangement, or similar transfer regardless of when the transfer occurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719 + Details
Name: | us-gaap_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Rate at which principal will not be repaid on securitized financial assets regardless of when the transfer occurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719 + Details
Name: | us-gaap_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesExpectedCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration