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Debt and Credit Facilities (Summary of Current Maturities of Long-term Debt) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 6,452	$ 4,349
Other debt securities
Debt Instrument [Line Items]
Current maturities of long-term debt	259
Duke Energy Florida
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 787	534
Duke Energy Florida | Debt Maturing October 2025 | Unsecured Debt
Debt Instrument [Line Items]
Interest rate	4.916%
Current maturities of long-term debt	$ 350
Duke Energy Florida | Debt Maturing October 2073 and April 2074 | First Mortgage Bonds
Debt Instrument [Line Items]
Facility term	12 months
Duke Energy Florida | Debt Maturing October 2073 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate	3.992%
Current maturities of long-term debt	$ 200
Duke Energy Florida | Debt Maturing April 2074 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate	3.992%
Current maturities of long-term debt	$ 173
Duke Energy Ohio
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 140	245
Duke Energy Ohio | Debt Maturing October 2025 | Unsecured Debt
Debt Instrument [Line Items]
Interest rate	3.23%
Current maturities of long-term debt	$ 95
Duke Energy (Parent) | Debt Maturing December 2025 | Unsecured Debt
Debt Instrument [Line Items]
Interest rate	5.00%
Current maturities of long-term debt	$ 500
Duke Energy (Parent) | Debt Maturing April 2026 | Unsecured Debt
Debt Instrument [Line Items]
Interest rate	4.125%
Current maturities of long-term debt	$ 1,725
Duke Energy (Parent) | Debt Maturing September 2026 | Unsecured Debt
Debt Instrument [Line Items]
Interest rate	2.65%
Current maturities of long-term debt	$ 1,500
Duke Energy (Parent) | Debt Maturing September 2026 | Unsecured Debt
Debt Instrument [Line Items]
Interest rate	5.124%
Current maturities of long-term debt	$ 1,200
Piedmont
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 505	$ 205
Piedmont | Debt Maturing August 2026 | Unsecured Debt
Debt Instrument [Line Items]
Interest rate	5.025%
Current maturities of long-term debt	$ 450

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