Contractual interest rate for funds borrowed, under the debt agreement.

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Debt and Credit Facilities (Summary of Current Maturities of Long-term Debt) (Details) - USD ($)	1 Months Ended
	May 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Current maturities of long-term debt		$ 3,171,000,000	$ 3,387,000,000
Other debt securities
Debt Instrument [Line Items]
Current maturities of long-term debt		821,000,000
Progress Energy
Debt Instrument [Line Items]
Current maturities of long-term debt		$ 393,000,000	1,082,000,000
Duke Energy (Parent) \| Debt Maturing August 2022, 2.400% interest rate \| Unsecured Debt
Debt Instrument [Line Items]
Interest Rate		2.40%
Current maturities of long-term debt		$ 500,000,000
Amount of debt retired	$ 500,000,000
Duke Energy (Parent) \| Debt Maturing April 2023, 2.875% Coupon \| Unsecured Debt
Debt Instrument [Line Items]
Interest Rate		2.875%
Current maturities of long-term debt		$ 350,000,000
Duke Energy (Parent) \| Debt Maturing June 2023, 1.938% Coupon \| Unsecured Debt
Debt Instrument [Line Items]
Interest Rate		1.938%
Current maturities of long-term debt		$ 500,000,000
Duke Energy Carolinas
Debt Instrument [Line Items]
Current maturities of long-term debt		$ 1,018,000,000	362,000,000
Duke Energy Carolinas \| Debt Maturing March 2023, 2.500% Coupon \| First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		2.50%
Current maturities of long-term debt		$ 500,000,000
Duke Energy Carolinas \| Debt Maturing March 2023, 3.050% Coupon \| First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		3.05%
Current maturities of long-term debt		$ 500,000,000
Duke Energy Progress
Debt Instrument [Line Items]
Current maturities of long-term debt		$ 66,000,000	$ 556,000,000