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v3.20.4

Debt and Credit Facilities (Narrative) (Details) |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2020 USD ($) | Mar. 27, 2020 USD ($) | Mar. 19, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Demand notes, maximum amount available for sale |  |  |  |  | $ 3,000,000,000 |  |  |  |
Demand notes, maximum amount outstanding |  |  |  |  | 1,500,000,000 |  |  |  |
Principal amount of demand notes |  |  |  |  | 1,168,000,000 |  | $ 1,049,000,000 |  |
Other loans outstanding against cash surrender value of life insurance policies |  |  |  |  | $ 817,000,000 |  | 777,000,000 |  |
Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  |  |  | 0.65 |  |  |  |
June 2017 Three Year Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  | $ 1,000,000,000 |  |  |  |
Term of debt instrument |  |  |  |  | 3 years |  |  |  |
Long-term line of credit |  |  |  |  | $ 500,000,000 | $ 500,000,000 |  |  |
Repayments of debt |  |  |  | $ 500,000,000 |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  | 8,000,000,000 |  |  | $ 8,000,000,000 |
Duke Energy (Parent) | Line of Credit | 364-day Term Loan Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  |  | 1,500,000,000 |  |  |
Drawings on credit facility |  | $ 188,000,000 | $ 1,500,000,000 |  |  |  |  |  |
Line of credit facility, increase limit |  |  |  |  |  | $ 500,000,000 |  |  |
Duke Energy Progress |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Other loans outstanding against cash surrender value of life insurance policies |  |  |  |  | $ 35,000,000 |  | 36,000,000 |  |
Duke Energy Progress | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  |  |  | 0.65 |  |  |  |
Duke Energy Progress | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  | $ 1,250,000,000 |  |  |  |
Duke Energy Progress | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  |  |  |  |  | $ 700,000,000
Term of debt instrument |  |  |  |  | 2 years |  |  |  |
Long-term line of credit |  |  |  |  |  |  | $ 700,000,000 |  |
Repayments of debt | $ 700,000,000 |  |  |  |  |  |  |  |
Piedmont | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  |  |  | 0.70 |  |  |  |
Piedmont | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  | $ 600,000,000 |  |  |  |
Duke Energy Carolinas | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  |  |  | 0.65 |  |  |  |
Duke Energy Carolinas | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  | $ 1,475,000,000 |  |  |  |
Progress Energy | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  |  |  | 0.65 |  |  |  |
Duke Energy Florida | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  |  |  | 0.65 |  |  |  |
Duke Energy Florida | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  | $ 800,000,000 |  |  |  |
Duke Energy Ohio | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  |  |  | 0.65 |  |  |  |
Duke Energy Ohio | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  | $ 625,000,000 |  |  |  |
Duke Energy Indiana | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  |  |  | 0.65 |  |  |  |
Duke Energy Indiana | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  | $ 600,000,000 |  |  |  |

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