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Organization and Basis of Presentation (Accounts Payable Finance Program) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Duke Energy (Parent)
Supplier Finance Program, Obligation [Roll Forward]
Confirmed obligations at beginning of period	$ 12	$ 28	$ 13	$ 50
Invoices confirmed during the period	15	26	47	146
Confirmed invoices paid during the period	(14)	(28)	(47)	(170)
Confirmed obligations at end of period	13	26	13	26
Piedmont
Supplier Finance Program, Obligation [Roll Forward]
Confirmed obligations at beginning of period	12	28	12	47
Invoices confirmed during the period	15	25	45	144
Confirmed invoices paid during the period	(14)	(28)	(44)	(166)
Confirmed obligations at end of period	$ 13	$ 25	$ 13	$ 25

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- Definition

Amount of obligation for supplier finance program.

+ References

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- Definition

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

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