Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Other (includes $54 at 2023 related to VIEs)	Other (includes $54 at 2023 related to VIEs)
Environmental reserves
Loss Contingencies [Line Items]
Reserves for Environmental Remediation	$ 88	$ 84
Environmental reserves | Duke Energy Carolinas
Loss Contingencies [Line Items]
Reserves for Environmental Remediation	23	22
Environmental reserves | Progress Energy
Loss Contingencies [Line Items]
Reserves for Environmental Remediation	19	19
Environmental reserves | Duke Energy Progress
Loss Contingencies [Line Items]
Reserves for Environmental Remediation	9	8
Environmental reserves | Duke Energy Florida
Loss Contingencies [Line Items]
Reserves for Environmental Remediation	10	11
Environmental reserves | Duke Energy Ohio
Loss Contingencies [Line Items]
Reserves for Environmental Remediation	36	33
Environmental reserves | Duke Energy Indiana
Loss Contingencies [Line Items]
Reserves for Environmental Remediation	2	3
Environmental reserves | Piedmont
Loss Contingencies [Line Items]
Reserves for Environmental Remediation	$ 7	$ 7