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Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | $ 90 | $ 88
Duke Energy Carolinas |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 24 | 19
Progress Energy |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 23 | 23
Duke Energy Progress |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 12 | 11
Duke Energy Florida |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 10 | 11
Duke Energy Ohio |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 33 | 34
Duke Energy Indiana |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 3 | 4
Piedmont |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | $ 7 | $ 9

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