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Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	$ 73	$ 68
Duke Energy Carolinas
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	36	24
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	9
Duke Energy Florida
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	9	10
Duke Energy Ohio
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	13	21
Duke Energy Indiana
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	2	2
Piedmont
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	$ 2	$ 2

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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