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Variable Interest Entities (Narrative) (Details) - USD ($)	1 Months Ended							9 Months Ended	12 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Apr. 30, 2025	Mar. 31, 2025	Jan. 31, 2025	Apr. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Dec. 31, 2024	Feb. 28, 2025	Feb. 29, 2024
Variable Interest Entities [Line Items]
Repayments of debt	$ 650,000,000	$ 150,000,000
Debt issuances	6,794,000,000							$ 6,794,000,000
DEPR accounts receivable securitization facility due April 2025 | Secured Debt
Variable Interest Entities [Line Items]
Repayments of debt			$ 400,000,000
Duke Energy Carolinas
Variable Interest Entities [Line Items]
Debt issuances	1,682,000,000							1,682,000,000
Duke Energy Progress
Variable Interest Entities [Line Items]
Debt issuances	2,561,000,000							2,561,000,000
Duke Energy (Parent)
Variable Interest Entities [Line Items]
Debt issuances	1,750,000,000							1,750,000,000
Duke Energy Indiana
Variable Interest Entities [Line Items]
Debt issuances	300,000,000							300,000,000
Duke Energy Ohio
Variable Interest Entities [Line Items]
Debt issuances	501,000,000							501,000,000
VIE primary beneficiary
Variable Interest Entities [Line Items]
Variable interest entity, financial or other support, amount								0	$ 0
VIE primary beneficiary | Duke Energy Florida | DEPR accounts receivable securitization facility due April 2025 | Secured Debt
Variable Interest Entities [Line Items]
Repayments of debt						$ 325,000,000
VIE primary beneficiary | Duke Energy Carolinas | DEPR accounts receivable securitization facility due April 2025 | Secured Debt
Variable Interest Entities [Line Items]
Repayments of debt					$ 500,000,000
VIE primary beneficiary | Duke Energy Progress | DEPR accounts receivable securitization facility due April 2025 | Secured Debt
Variable Interest Entities [Line Items]
Repayments of debt				$ 400,000,000
VIE primary beneficiary | DEFR | Duke Energy Florida
Variable Interest Entities [Line Items]
Accounts receivable from securitization							$ 459,000,000
VIE primary beneficiary | DEFR | Duke Energy Carolinas
Variable Interest Entities [Line Items]
Accounts receivable from securitization									$ 1,081,000,000
VIE primary beneficiary | DEPR | Duke Energy (Parent)
Variable Interest Entities [Line Items]
Accounts receivable from securitization										$ 943,000,000
VIE primary beneficiary | Cinergy Receivables
Variable Interest Entities [Line Items]
Repayments of debt							$ 350,000,000
Accounts receivable from securitization											$ 682,000,000
VIE primary beneficiary | Cinergy Receivables | Duke Energy Indiana
Variable Interest Entities [Line Items]
Accounts receivable from securitization											316,000,000
VIE primary beneficiary | Cinergy Receivables | Duke Energy Ohio
Variable Interest Entities [Line Items]
Accounts receivable from securitization											$ 366,000,000
VIE primary beneficiary | DEPSCSF | Duke Energy Progress | Secured Debt
Variable Interest Entities [Line Items]
Debt issuances						$ 177,000,000
VIE primary beneficiary | DECNCSFII | Duke Energy Carolinas | Secured Debt
Variable Interest Entities [Line Items]
Debt issuances	582,000,000							582,000,000
VIE primary beneficiary | DEPNCSFII | Duke Energy Progress | Secured Debt
Variable Interest Entities [Line Items]
Debt issuances	$ 461,000,000							$ 461,000,000

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