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Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | $ 86 | $ 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 | 20 | 19
Duke Energy Progress |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 9 | 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 | 33 | 33
Duke Energy Indiana |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 3 | 3
Piedmont |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | $ 7 | $ 7

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