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Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | $ 66 | $ 58
Environmental exit costs, reasonably possible additional loss | 56 |
Duke Energy Carolinas |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 16 | 11
Environmental exit costs, reasonably possible additional loss | 12 |
Progress Energy |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 15 | 16
Duke Energy Progress |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 5 | 4
Duke Energy Florida |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 8 | 9
Duke Energy Ohio |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 22 | 19
Environmental exit costs, reasonably possible additional loss | 38 |
Duke Energy Indiana |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 5 | 4
Piedmont Natural Gas |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | $ 8 | $ 8

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