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Regulatory Matters (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 22, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Impairment of assets and other charges |  |  | $ 356 | $ 984 | $ (8)
Duke Energy Ohio |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Limit of total capital |  |  | 30.00% |  |
Impairment of assets and other charges |  |  | $ 25 |  |
Duke Energy Kentucky |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Required minimum equity capital structure |  |  | 35.00% |  |
Duke Energy Carolinas and Duke Energy Progress | CCR Settlement Agreement |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Recovery costs not sought | $ 1,000 |  |  |  |
Recovery costs amortization period | 5 years |  |  |  |
Equity return on deferred coal ash cost future cases | 1.50% |  |  |  |
Duke Energy Carolinas and Duke Energy Progress | CCR Settlement Agreement | NCUC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Requested capital structure, percentage | 48.00% |  |  |  |
Requested debt structure, percentage | 52.00% |  |  |  |
Duke Energy Carolinas |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Impairment of assets and other charges |  |  | $ 227 | 476 | 17
Duke Energy Carolinas | CCR Settlement Agreement |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Impairment of assets and other charges |  | $ 454 |  |  |
Reversal of regulated electric operating revenues |  | 50 |  |  |
Duke Energy Progress |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Impairment of assets and other charges |  |  | $ 63 | $ 499 | $ 12
Duke Energy Progress | CCR Settlement Agreement |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Impairment of assets and other charges |  | 494 |  |  |
Reversal of regulated electric operating revenues |  | $ 102 |  |  |

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