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Commitments and Contingencies (Narrative) (Details) $ in Millions |  | 12 Months Ended | 58 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 16, 2021 people | Dec. 31, 2021 USD ($) reactor plant | Dec. 31, 2021 USD ($) reactor plant | Feb. 09, 2022 USD ($) | Dec. 31, 2020 USD ($) | Jun. 18, 2018 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of licensed nuclear reactors | reactor |  | 95 | 95 |  |  |
Insured public liability limit per nuclear incident |  | $ 13,500.0 | $ 13,500.0 |  |  |
Excess nuclear liability program coverage |  | 13,100.0 | 13,100.0 |  |  |
Pro rata assessment for each reactor owned for each incident exceeding public liability insurance |  | 138.0 | 138.0 |  |  |
Annual payment limit to pro rata assessments |  | 20.5 | 20.5 |  |  |
Industry aggregate limit |  | 3,200.0 | 3,200.0 |  |  |
Sublimit for non-nuclear terrorist events |  | 1,800.0 | 1,800.0 |  |  |
Sublimit property damage losses |  | 1,500.0 | 1,500.0 |  |  |
Additional nuclear accident limit |  | $ 1,250.0 | $ 1,250.0 |  |  |
Insurance coverage percentage initial weeks |  | 100.00% | 100.00% |  |  |
Accidental outage insurance coverage initial weeks |  | 365 days |  |  |  |
Insurance coverage percentage additional weeks |  | 80.00% | 80.00% |  |  |
Accidental outage insurance coverage additional weeks |  | 770 days |  |  |  |
Weeks of sublimits for accidental outage coverage |  | 728 days |  |  |  |
Sublimit accidental outage recovery |  | $ 328.0 | $ 328.0 |  |  |
Maximum magnitude of retroactive premiums |  | 10 | 10 |  |  |
Maximum period for retroactive premium assessment |  | 6 years |  |  |  |
Coal Ash Insurance Coverage Litigation |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of NC and SC plants with ash basins | plant |  | 15 | 15 |  |  |
Duke Energy Carolinas |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Primary nuclear liability program coverage |  | $ 450.0 | $ 450.0 |  |  |
Max retroactive premium assessments |  | $ 140.0 |  |  |  |
Duke Energy Carolinas | Catawba |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of licensed nuclear reactors | reactor |  | 2 | 2 |  |  |
Dedicated additional nuclear accident limit |  | $ 1,250.0 | $ 1,250.0 |  |  |
Additional Non-nuclear accident limit |  | 750.0 | 750.0 |  |  |
Accidental outage insurance coverage policy limit |  | $ 490.0 | $ 490.0 |  |  |
Potential obligation percentage |  | 100.00% | 100.00% |  |  |
Duke Energy Carolinas | McGuire |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of licensed nuclear reactors | reactor |  | 2 | 2 |  |  |
Accidental outage insurance coverage policy limit |  | $ 434.0 | $ 434.0 |  |  |
Duke Energy Carolinas | Oconee |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of licensed nuclear reactors | reactor |  | 3 | 3 |  |  |
Additional Non-nuclear accident limit |  | $ 750.0 | $ 750.0 |  |  |
Accidental outage insurance coverage policy limit |  | 322.0 | 322.0 |  |  |
Duke Energy Carolinas | Ruben Villano, et al. v. Duke Energy Carolinas, LLC | Pending Litigation |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of individuals | people | 9 |  |  |  |  |
Number of survivors | people | 4 |  |  |  |  |
Number of deceased individuals | people | 5 |  |  |  |  |
Duke Energy Carolinas | Asbestos Issue |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Asbestos-related injuries and damages reserves |  | 501.0 | 501.0 |  | $ 572.0 |
Loss contingency, receivable, noncurrent |  | 644.0 | 644.0 |  | 704.0 |
Duke Energy Progress |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Primary nuclear liability program coverage |  | 450.0 | $ 450.0 |  |  |
Max retroactive premium assessments |  | $ 88.0 |  |  |  |
Duke Energy Progress | Harris |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of licensed nuclear reactors | reactor |  | 1 | 1 |  |  |
Accidental outage insurance coverage policy limit |  | $ 364.0 | $ 364.0 |  |  |
Duke Energy Progress | Robinson |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of licensed nuclear reactors | reactor |  | 1 | 1 |  |  |
Accidental outage insurance coverage policy limit |  | $ 280.0 | $ 280.0 |  |  |
Duke Energy Progress | Brunswick |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of licensed nuclear reactors | reactor |  | 2 | 2 |  |  |
Accidental outage insurance coverage policy limit |  | $ 336.0 | $ 336.0 |  |  |
Duke Energy Progress | Spent Nuclear Fuel Matters |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Damages sought |  |  |  |  |  | $ 100.0
Duke Energy Florida |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Primary nuclear liability program coverage |  | 100.0 | 100.0 |  |  |
Max retroactive premium assessments |  | 1.0 |  |  |  |
Duke Energy Florida | Crystal River Unit 3 |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Sublimit property damage losses |  | 50.0 | 50.0 |  |  |
Duke Energy Florida | Spent Nuclear Fuel Matters |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Damages sought |  |  |  |  |  | $ 200.0
Duke Energy Florida | Spent Nuclear Fuel Matters | Subsequent Event |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Damages sought |  |  |  | $ 60.0 |  |
Duke Energy Carolinas and Duke Energy Progress | Coal Ash Insurance Coverage Litigation |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Proceeds from legal settlements |  |  | 418.0 |  |  |
Duke Energy and Duke Energy Carolinas | ASU 2016-13 |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Premium receivable, allowance for credit loss |  | $ 12.0 | $ 12.0 |  | $ 15.0 |

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