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Debt and Credit Facilities (Narrative) (Details) - USD ($)				3 Months Ended
	Nov. 07, 2024	Apr. 24, 2024	Mar. 26, 2024	Jun. 30, 2024	Sep. 30, 2024	Mar. 31, 2024
Master Credit Facility
Debt Instrument [Line Items]
Facility size					$ 9,000,000,000	$ 9,000,000,000
Duke Energy Florida | Master Credit Facility
Debt Instrument [Line Items]
Facility size					875,000,000
Duke Energy Progress | Master Credit Facility
Debt Instrument [Line Items]
Facility size					1,500,000,000
Duke Energy Carolinas | Master Credit Facility
Debt Instrument [Line Items]
Facility size					$ 1,400,000,000
Term Loan Facility | Duke Energy Term Loan Facility | Subsequent event
Debt Instrument [Line Items]
Facility term (in years)	2 years
Term Loan Facility | Duke Energy (Parent) | Duke Energy Term Loan Facility
Debt Instrument [Line Items]
Facility size			$ 700,000,000
Repayments of debt				$ 500,000,000
Facility term (in years)			364 days
Extension period (in years)			30 days
Borrowing amount		$ 500,000,000
Term Loan Facility | Duke Energy Florida | Duke Energy Term Loan Facility | Subsequent event
Debt Instrument [Line Items]
Facility size	$ 800,000,000
Facility term (in years)	364 days
Extension period (in years)	4 months
Borrowing amount	$ 100,000,000
Increase in term loan facility	400,000,000
Term Loan Facility | Duke Energy Progress | Duke Energy Term Loan Facility | Subsequent event
Debt Instrument [Line Items]
Facility size	$ 250,000,000
Extension period (in years)	6 months
Borrowing amount	$ 50,000,000
Increase in term loan facility	150,000,000
Term Loan Facility | Duke Energy Carolinas | Duke Energy Term Loan Facility | Subsequent event
Debt Instrument [Line Items]
Facility size	$ 700,000,000
Extension period (in years)	6 months
Borrowing amount	$ 50,000,000
Increase in term loan facility	$ 300,000,000

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