Name:	duk_GuaranteeObligationsMaximumExposurePercentage
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Percent of proceeds from accounts receivable securitization received as cash.

No definition available.

Name:	duk_Percentofproceedsreceivedascash
Namespace Prefix:	duk_
Data Type:	num:percentItemType
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Percent of proceeds from accounts receivable securitization received as subordinated note.

No definition available.

Name:	duk_Percentofproceedsreceivedassubordinatednote
Namespace Prefix:	duk_
Data Type:	num:percentItemType
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Period Type:	instant

Minimum equity Balance required by Cinergy Receivables

No definition available.

Name:	duk_ReceivablesToMaintainMinimumEquityBalance
Namespace Prefix:	duk_
Data Type:	xbrli:monetaryItemType
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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248

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The amount of financial or other support the reporting entity has provided (explicitly or implicitly) to the Variable Interest Entity (VIE) that it was not previously contractually required to provide or that the reporting entity intends to provide, including, for example, situations in which the reporting entity assisted the VIE in obtaining another type of support.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118582676&loc=SL6759159-111685

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Period Type:	duration

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.

No definition available.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=118582676&loc=SL6759159-111685

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
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Data Type:	num:percentItemType
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Period Type:	duration

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Data Type:	na
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Name:	srt_CounterpartyNameAxis=duk_PioneerTransmissionMember
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Data Type:	na
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Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
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Name:	srt_CounterpartyNameAxis=duk_OVECMember
Namespace Prefix:
Data Type:	na
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