Organization and Basis of Presentation (Accounts Payable Finance Program) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Duke Energy (Parent)
Supplier Finance Program, Obligation [Roll Forward]
Confirmed obligations at beginning of period	$ 18	$ 76	$ 13	$ 50
Invoices confirmed during the period	14	63	32	120
Confirmed invoices paid during the period	(20)	(111)	(33)	(142)
Confirmed obligations at end of period	12	28	12	28
Piedmont
Supplier Finance Program, Obligation [Roll Forward]
Confirmed obligations at beginning of period	18	74	12	47
Invoices confirmed during the period	12	63	30	119
Confirmed invoices paid during the period	(18)	(109)	(30)	(138)
Confirmed obligations at end of period	$ 12	$ 28	$ 12	$ 28

Amount of obligation for supplier finance program.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 405
-SubTopic 50
-Name Accounting Standards Codification
-Section 55
-Paragraph 5
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
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-Section 50
-Paragraph 3
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- Definition

Amount of decrease in obligation for supplier finance program from settlement.

+ References

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- Definition

Amount of increase in obligation for supplier finance program.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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