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Debt and Credit Facilities (Narrative) (Details) |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 09, 2022 USD ($) | Jan. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 | Dec. 31, 2022 USD ($) | Dec. 31, 2022 EUR (€) | Oct. 31, 2022 USD ($) | Mar. 31, 2022 USD ($) | Mar. 01, 2022 USD ($) | Dec. 31, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  | $ 9,186,000,000 |  | $ 9,186,000,000 |  |  |  |  | $ 8,107,000,000
Demand notes, maximum amount available for sale |  |  | 4,000,000,000 |  | 4,000,000,000 |  |  |  |  |
Demand notes, maximum amount outstanding |  |  | 2,000,000,000 |  | 2,000,000,000 |  |  |  |  |
Principal amount of demand notes |  |  | 897,000,000 |  | 897,000,000 |  |  |  |  | 1,066,000,000
Current maturities of long-term debt |  |  | 4,154,000,000 |  | 4,154,000,000 |  |  |  |  | 3,387,000,000
Other loans outstanding against cash surrender value of life insurance policies |  |  | 852,000,000 |  | 852,000,000 |  |  |  |  | 819,000,000
Other Loans |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Current maturities of long-term debt |  |  | 131,000,000 |  | 131,000,000 |  |  |  |  |
Duke Energy Ohio |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Current maturities of long-term debt |  |  | 475,000,000 |  | 475,000,000 |  |  |  |  |
Duke Energy Indiana |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Current maturities of long-term debt |  |  | 303,000,000 |  | 303,000,000 |  |  |  |  | 84,000,000
Duke Energy Progress |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  | 1,352,000,000 |  | 1,352,000,000 |  |  |  |  | 1,870,000,000
Current maturities of long-term debt |  |  | 369,000,000 |  | 369,000,000 |  |  |  |  | 556,000,000
Other loans outstanding against cash surrender value of life insurance policies |  |  | 33,000,000 |  | 33,000,000 |  |  |  |  | 34,000,000
Progress Energy |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Current maturities of long-term debt |  |  | 697,000,000 |  | 697,000,000 |  |  |  |  | 1,082,000,000
Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  | 1,150,000,000 |  | 1,150,000,000 |  |  |  |  | 1,237,000,000
Current maturities of long-term debt |  |  | 1,018,000,000 |  | 1,018,000,000 |  |  |  |  | 362,000,000
Duke Energy Florida |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  | 500,000,000 |  | 500,000,000 |  |  |  |  | 1,150,000,000
Current maturities of long-term debt |  |  | 328,000,000 |  | 328,000,000 |  |  |  |  | 76,000,000
Piedmont |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  | 400,000,000 |  | 400,000,000 |  |  |  |  | 350,000,000
Current maturities of long-term debt |  |  | $ 45,000,000 |  | $ 45,000,000 |  |  |  |  | $ 0
Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  | 0.65 |  | 0.65 | 0.65 |  |  |  |
Maximum | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  | 0.65 |  | 0.65 | 0.65 |  |  |  |
Maximum | Duke Energy Indiana |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  | 0.65 |  | 0.65 | 0.65 |  |  |  |
Maximum | Duke Energy Progress |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  | 0.65 |  | 0.65 | 0.65 |  |  |  |
Maximum | Progress Energy |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  | 0.65 |  | 0.65 | 0.65 |  |  |  |
Maximum | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  | 0.65 |  | 0.65 | 0.65 |  |  |  |
Maximum | Duke Energy Florida |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  | 0.65 |  | 0.65 | 0.65 |  |  |  |
Maximum | Piedmont |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  | 0.70 |  | 0.70 | 0.70 |  |  |  |
First Mortgage Bonds | Duke Energy Carolinas | Subsequent Event | January 2023 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  | $ 1,800,000,000 |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | 1,000,000,000 |  |  |  |  |  |  |  |
First Mortgage Bonds | Duke Energy Carolinas | Subsequent Event | January 2023 Notes At 4.95% |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  | $ 900,000,000 |  |  |  |  |  |  |  |
Term (in years) |  | 10 years |  |  |  |  |  |  |  |
Interest Rate |  | 4.95% |  |  |  |  |  |  |  |
First Mortgage Bonds | Duke Energy Carolinas | Subsequent Event | January 2023 Notes At 5.35% |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  | $ 900,000,000 |  |  |  |  |  |  |  |
Term (in years) |  | 30 years |  |  |  |  |  |  |  |
Interest Rate |  | 5.35% |  |  |  |  |  |  |  |
Unsecured Debt | June 2022 Notes Due 2034 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances | € |  |  |  |  |  | € 500,000,000 |  |  |  |
Interest Rate |  |  | 3.85% |  | 3.85% | 3.85% |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Facility size |  |  | $ 9,000,000,000 |  | $ 9,000,000,000 |  |  | $ 9,000,000,000 | $ 8,000,000,000 |
Revolving Credit Facility | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Facility size |  |  | 900,000,000 |  | 900,000,000 |  |  |  |  |
Revolving Credit Facility | Duke Energy Indiana |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Facility size |  |  | 1,050,000,000 |  | 1,050,000,000 |  |  |  |  |
Revolving Credit Facility | Duke Energy Progress |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Facility size |  |  | 800,000,000 |  | 800,000,000 |  |  |  |  |
Revolving Credit Facility | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Facility size |  |  | 1,925,000,000 |  | 1,925,000,000 |  |  |  |  |
Revolving Credit Facility | Duke Energy Florida |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Facility size |  |  | 1,150,000,000 |  | 1,150,000,000 |  |  |  |  |
Revolving Credit Facility | Piedmont |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Facility size |  |  | 800,000,000 |  | $ 800,000,000 |  |  |  |  |
Revolving Credit Facility | Line of Credit | Progress Energy |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  |  |  |  | $ 2,500,000,000 |  |
Revolving Credit Facility | Line of Credit | Duke Energy Florida |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  |  |  | $ 800,000,000 |  |  |
Revolving Credit Facility | Line of Credit | Duke Energy (Parent) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Facility size | $ 1,400,000,000 |  |  |  |  |  |  |  |  |
Extension period (in years) | 2 years |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 400,000,000 |  |  |  |  |  |  |
June 2017 Three Year Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Term (in years) |  |  |  | 3 years | 3 years |  |  |  |  |

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