Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	$ 86	$ 88
Duke Energy Carolinas
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	23	23
Progress Energy
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	19	19
Duke Energy Progress
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	9	9
Duke Energy Florida
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	10	10
Duke Energy Ohio
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	34	36
Duke Energy Indiana
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	2	2
Piedmont
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	$ 7	$ 7