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Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | $ 75 | $ 58
Duke Energy Carolinas |  |
Disclosure Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 19 | 11
Progress Energy |  |
Disclosure Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 19 | 16
Duke Energy Progress |  |
Disclosure Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 6 | 4
Duke Energy Florida |  |
Disclosure Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 12 | 9
Duke Energy Ohio |  |
Disclosure Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 22 | 19
Duke Energy Indiana |  |
Disclosure Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 6 | 4
Piedmont |  |
Disclosure Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 10 | $ 8
Environmental reserves |  |
Disclosure Environmental Matters Details [Line Items] |  |
Additional losses in excess of recorded reserves that could be incurred | 25 |
Environmental reserves | Duke Energy Carolinas |  |
Disclosure Environmental Matters Details [Line Items] |  |
Additional losses in excess of recorded reserves that could be incurred | 12 |
Environmental reserves | Duke Energy Ohio |  |
Disclosure Environmental Matters Details [Line Items] |  |
Additional losses in excess of recorded reserves that could be incurred | 4 |
Environmental reserves | Piedmont |  |
Disclosure Environmental Matters Details [Line Items] |  |
Additional losses in excess of recorded reserves that could be incurred | $ 2 |

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