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Variable Interest Entities (Narrative) (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2017
Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Variable interest entity, financial or other support, amount | $ 0 | $ 0
Cinergy Receivables [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Percent of proceeds received as cash | 75.00% |
Percent of proceeds received as subordinated note | 25.00% |
Minimum equity balance required by Cinergy Receivables | $ 3,000,000 |
Pioneer Transmission [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Variable interest entity ownership interest | 50.00% |
OVEC [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Variable interest entity ownership interest | 9.00% |
Atlantic Coast Pipeline [Member] | Financial Guarantee [Member] |  |
Variable Interest Entities [Line Items] |  |
Maximum potential amount of future payments associated with guarantees | $ 790,000,000 |
Percentage of potential amount of future payments associated with guarantees as percent of outstanding borrowings | 47.00% |

X
- Definition Maximum potential percentage of future payments the guarantor could be required to make under the guarantee in relationship to the total borrowings by the joint venture on the credit facility. + References No definition available. + Details
Name: | duk_GuaranteeObligationsMaximumExposurePercentage
Namespace Prefix: | duk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent of proceeds from accounts receivable securitization received as cash. + References No definition available. + Details
Name: | duk_Percentofproceedsreceivedascash
Namespace Prefix: | duk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percent of proceeds from accounts receivable securitization received as subordinated note. + References No definition available. + Details
Name: | duk_Percentofproceedsreceivedassubordinatednote
Namespace Prefix: | duk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Minimum equity Balance required by Cinergy Receivables + References No definition available. + Details
Name: | duk_ReceivablesToMaintainMinimumEquityBalance
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition 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. + References 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 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition 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. + References 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 + Details
Name: | us-gaap_VariableInterestEntityFinancialOrOtherSupportAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References 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 + Details
Name: | us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | srt_CounterpartyNameAxis=duk_PioneerTransmissionMember
Namespace Prefix: |
Data Type: | na
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- Details
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- Details
Name: | srt_CounterpartyNameAxis=duk_OVECMember
Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_FinancialGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |