Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	$ 90	$ 84
Duke Energy Carolinas
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	24	22
Progress Energy
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	20	19
Duke Energy Progress
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	10	8
Duke Energy Florida
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	10	11
Duke Energy Ohio
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	36	33
Duke Energy Indiana
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	2	3
Piedmont
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	$ 7	$ 7