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Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - Environmental reserves - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Loss Contingencies [Line Items] |  |
Reserves for Environmental Remediation | $ 88 | $ 75
Duke Energy Carolinas |  |
Loss Contingencies [Line Items] |  |
Reserves for Environmental Remediation | 19 | 19
Progress Energy |  |
Loss Contingencies [Line Items] |  |
Reserves for Environmental Remediation | 23 | 19
Duke Energy Progress |  |
Loss Contingencies [Line Items] |  |
Reserves for Environmental Remediation | 11 | 6
Duke Energy Florida |  |
Loss Contingencies [Line Items] |  |
Reserves for Environmental Remediation | 11 | 12
Duke Energy Ohio |  |
Loss Contingencies [Line Items] |  |
Reserves for Environmental Remediation | 34 | 22
Duke Energy Indiana |  |
Loss Contingencies [Line Items] |  |
Reserves for Environmental Remediation | 4 | 6
Piedmont |  |
Loss Contingencies [Line Items] |  |
Reserves for Environmental Remediation | $ 9 | $ 10

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