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Regulatory Matters (Narrative) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 02, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Public Utilities, General Disclosures [Line Items] |  |  |  |
Operation, maintenance and other |  | $ 6,066 | $ 6,463 | $ 5,944
Hurricane Florence, Hurricane Michael and Winter Storm Diego |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Operation, maintenance and other | $ 553 |  |  |
Estimated capital cost | 96 |  |  |
Duke Energy Ohio |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Limit of total capital |  | 30.00% |  |
Operation, maintenance and other |  | $ 520 | 480 | 530
Duke Energy Kentucky |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Required minimum equity capital structure |  | 35.00% |  |
Duke Energy Carolinas |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Operation, maintenance and other |  | $ 1,868 | 2,130 | 2,021
Duke Energy Carolinas | Hurricane Florence, Hurricane Michael and Winter Storm Diego |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Operation, maintenance and other | 171 |  |  |
Estimated capital cost | 20 |  |  |
Duke Energy Progress |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Operation, maintenance and other |  | $ 1,446 | $ 1,578 | $ 1,439
Duke Energy Progress | Hurricane Florence, Hurricane Michael and Winter Storm Diego |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Operation, maintenance and other | 382 |  |  |
Estimated capital cost | $ 76 |  |  |

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