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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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