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Variable Interest Entities (Fair Value Assumptions) (Details) - CRC - Non-consolidated VIEs | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Duke Energy Ohio |  |
Variable Interest Entity [Line Items] |  |
Anticipated credit loss ratio | 0.50% | 0.60%
Discount rate | 1.60% | 3.30%
Receivable turnover rate | 13.40% | 13.40%
Duke Energy Indiana |  |
Variable Interest Entity [Line Items] |  |
Anticipated credit loss ratio | 0.30% | 0.30%
Discount rate | 1.60% | 3.30%
Receivable turnover rate | 11.30% | 11.50%

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- Definition The ratio of total receivables to total monthly billings, as related to total receivables. + References No definition available. + Details
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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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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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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

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- Details
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- Details
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