Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	$ 92	$ 84
Duke Energy Carolinas
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	23	22
Progress Energy
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	23	19
Duke Energy Progress
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	11	8
Duke Energy Florida
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	11	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	$ 8	$ 7