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Debt and Credit Facilities (Narrative) (Details) |  |  |  | 1 Months Ended | 12 Months Ended |  |
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Jan. 05, 2024 USD ($) | Jun. 30, 2023 day | Apr. 03, 2023 | Apr. 30, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares | Sep. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) $ / shares | Jan. 31, 2024 USD ($) | Mar. 31, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  |  |  | $ 9,186,000,000 |  |  | $ 9,825,000,000 |  |
Common stock, par value (in usd per share) | $ / shares |  |  |  |  | $ 0.001 |  |  | $ 0.001 |  |
Demand notes, maximum amount available for sale |  |  |  |  |  | $ 4,000,000,000 |  |  |  |
Demand notes, maximum amount outstanding |  |  |  |  |  | $ 2,000,000,000 |  |  |  |
Principal amount of demand notes |  |  |  |  | $ 897,000,000 |  |  | $ 985,000,000 |  |
Current maturities of long-term debt |  |  |  |  | 3,878,000,000 |  |  | 2,800,000,000 |  |
Other loans outstanding against cash surrender value of life insurance policies |  |  |  |  | 852,000,000 |  |  | $ 873,000,000 |  |
Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  |  |  |  |  |  | 0.65 |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  |  |  |  | $ 9,000,000,000 |  | $ 9,000,000,000
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  | 39,000,000 |  |
June 2017 Three Year Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Term (in years) |  |  |  |  |  | 3 years | 3 years |  |  |
January 2024 Senior Unsecured Notes | Unsecured Debt | Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  |  |  |  |  |  |  | $ 1,250,000,000 |
January 2024 Senior Unsecured Notes, Three Year Tranche | Unsecured Debt | Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances | $ 600,000,000 |  |  |  |  |  |  |  |  |
Term (in years) | 3 years |  |  |  |  |  |  |  |  |
January 2024 Senior Unsecured Notes, Five Year Tranche | Unsecured Debt | Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances | $ 650,000,000 |  |  |  |  |  |  |  |  |
Term (in years) | 5 years |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 4.85% |  |  |  |  |  |  |  |  |
Variable Rate Term Loan Due March 2024 | Secured Debt | Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 1,000,000,000 |  |  |  |  |  |  |  |  |
4.25% Convertible Senior notes Due April 2026 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 4.125% |  |  |  |  |  |
4.25% Convertible Senior notes Due April 2026 | Convertible Debt | Debt Conversion Terms One |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Trading days (in days) | day |  | 20 |  |  |  |  |  |  |  |
Consecutive trading days (in days) | day |  | 30 |  |  |  |  |  |  |  |
Debt conversion rate (as a percent) |  | 130.00% |  |  |  |  |  |  |  |
4.25% Convertible Senior notes Due April 2026 | Convertible Debt | Debt Conversion Terms Two |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Trading days (in days) | day |  | 5 |  |  |  |  |  |  |  |
Consecutive trading days (in days) | day |  | 10 |  |  |  |  |  |  |  |
Debt conversion rate (as a percent) |  | 98.00% |  |  |  |  |  |  |  |
Term Loan Due April 2024 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  | 800,000,000 |  |
Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  |  |  | 1,150,000,000 |  |  | 2,650,000,000 |  |
Current maturities of long-term debt |  |  |  |  | 1,018,000,000 |  |  | $ 19,000,000 |  |
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 |  |  |  |  |  |  |  | $ 1,575,000,000 |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  | 4,000,000 |  |
Duke Energy Carolinas | January 2024 Notes | First Mortgage Bonds | Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances | 1,000,000,000 |  |  |  |  |  |  |  |  |
Duke Energy Carolinas | January 2024 Notes At 4.95% | First Mortgage Bonds | Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances | $ 575,000,000 |  |  |  |  |  |  |  |  |
Term (in years) | 10 years |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 4.85% |  |  |  |  |  |  |  |  |
Duke Energy Carolinas | January 2024 Notes At 5.340% | First Mortgage Bonds | Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances | $ 425,000,000 |  |  |  |  |  |  |  |  |
Term (in years) | 30 years |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 5.40% |  |  |  |  |  |  |  |  |
Parent |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  |  |  |  |  |  | 3,075,000,000 |  |
Parent | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | 400,000,000 |  |  |  |  |
Facility size |  |  |  |  |  |  | $ 1,400,000,000 |  |  |
Parent | Line of Credit | Subsequent Event | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  |  | $ 1,000,000,000 |
Parent | 4.25% Convertible Senior notes Due April 2026 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  |  | $ 1,700,000,000 |  |  |  |  |  |
Debt conversion rate (as a percent) |  |  | 25.00% |  |  |  |  |  |  |
Common stock, par value (in usd per share) | $ / shares |  |  |  | $ 0.001 |  |  |  |  |  |
Conversion ratio |  |  |  | 0.0084131 |  |  |  |  |  |
Duke Energy Florida |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  |  |  | 500,000,000 |  |  | 1,500,000,000 |  |
Current maturities of long-term debt |  |  |  |  | $ 328,000,000 |  |  | $ 589,000,000 |  |
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 |  |  |  |  |  |  |  | $ 950,000,000 |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  | $ 7,000,000 |  |
Progress Energy |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, par value (in usd per share) | $ / shares |  |  |  |  | $ 0.01 |  |  | $ 0.01 |  |
Current maturities of long-term debt |  |  |  |  | $ 697,000,000 |  |  | $ 661,000,000 |  |
Progress Energy | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt to total capitalization percentage, for each borrower |  |  |  |  |  |  |  | 0.65 |  |
Progress Energy | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  |  |  | $ 2,500,000,000 |  |  |
Duke Energy Ohio |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  |  |  |  |  |  | $ 750,000,000 |  |
Common stock, par value (in usd per share) | $ / shares |  |  |  |  | $ 8.50 |  |  | $ 8.50 |  |
Current maturities of long-term debt |  |  |  |  | $ 475,000,000 |  |  |  |  |
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 |  |  |  |  |  |  |  | $ 1,050,000,000 |  |
Duke Energy Indiana |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  |  |  |  |  |  | 500,000,000 |  |
Current maturities of long-term debt |  |  |  |  | 303,000,000 |  |  | $ 4,000,000 |  |
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 |  |  |  |  |  |  |  | $ 950,000,000 |  |
Duke Energy Progress |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  |  |  | 1,352,000,000 |  |  | 1,000,000,000 |  |
Current maturities of long-term debt |  |  |  |  | 369,000,000 |  |  | 72,000,000 |  |
Other loans outstanding against cash surrender value of life insurance policies |  |  |  |  | 33,000,000 |  |  | $ 32,000,000 |  |
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 |  |  |  |  |  |  |  | $ 1,400,000,000 |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  | 1,000,000 |  |
Piedmont |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  |  |  | $ 400,000,000 |  |  | $ 350,000,000 |  |
Common stock, par value (in usd per share) | $ / shares |  |  |  |  | $ 0 |  |  | $ 0 |  |
Current maturities of long-term debt |  |  |  |  | $ 45,000,000 |  |  | $ 40,000,000 |  |
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 |  |  |  |  |  |  |  | $ 800,000,000 |  |

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