Business Segments (Narrative) (Details) $ in Millions	6 Months Ended
Jun. 30, 2021 USD ($) segment
Duke Energy Ohio
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	2
Wind and solar \| Nonregulated
Segment Reporting Information [Line Items]
Renewable merchant plants \| $	$ 208
Joint owner ownership percentage	50.00%

The proportionate share of interest (percent) in a jointly owned utility plant.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.C)
-URI http://asc.fasb.org/extlink&oid=122136288&loc=d3e659983-123033

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Period Type:	instant

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599

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- Definition

Period end amount of property, plant and equipment (PPE) related to generation or processing owned by public utility.

+ References

No definition available.

+ 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.

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- Details

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- Details

Name:	us-gaap_PublicUtilityAxis=duk_WindandSolarPlantMember
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- Details

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