v3.3.0.814

Variable Interest Entities (Fair Value Assumptions)(Details) - Cinergy Receivables [Member] | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
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 | 12.90% | 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 | 10.60% | 10.50%

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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=51814546&loc=d3e107314-111719 + Details
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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=51814546&loc=d3e107314-111719 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ConsolidationItemsAxis=duk_CinergyReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=duk_DukeEnergyIndianaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |