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Commitments and Contingencies (Narrative) (Details) $ in Millions |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 18, 2018 USD ($) | Sep. 30, 2020 USD ($) plant claim | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($)
ASU 2016-13 | ACP |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Reserve for credit losses for financial guarantees |  |  | $ 95 |
Coal Ash Insurance Coverage Litigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of NC and SC Plants with Ash Basins | plant |  | 15 |  |
Duke Energy Carolinas | Asbestos-related Injuries and Damages Claims |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Asbestos-related injuries and damages reserves |  | $ 578 |  | $ 604
Reinsurance retention policy, excess retention, amount reinsured |  | 714 |  |
Probable insurance recoveries |  | $ 704 |  | $ 742
Duke Energy Carolinas | Asbestos-related Injuries and Damages Claims | Non-malignant cases |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency, pending claims, number | claim |  | 159 |  |
Asbestos-related injuries and damages reserves |  | $ 41 |  |
Duke Energy Carolinas | Asbestos-related Injuries and Damages Claims | Malignant cases |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency, pending claims, number | claim |  | 68 |  |
Asbestos-related injuries and damages reserves |  | $ 23 |  |
Duke Energy Progress | Spent Nuclear Fuel Matters |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Pending litigation, damages sought | $ 100 |  |  |
Duke Energy Florida | Spent Nuclear Fuel Matters |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Pending litigation, damages sought | $ 203 |  |  |
Duke Energy and Duke Energy Carolinas | ASU 2016-13 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Reserve for credit losses for insurance receivables |  | 15 |  |
Other Noncurrent Liabilities | ASU 2016-13 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Reserve for credit losses for financial guarantees |  | 4 |  |
ACP | Other Current Liabilities | ACP |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Guarantees of outstanding debt |  | $ 860 |  |

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