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Debt and Credit Facilities (Tables) | 3 Months Ended
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Mar. 31, 2024
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | The following table summarizes significant debt issuances (in millions).
|  |  |  |  | Three Months Ended March 31, 2024
|  |  |  |  |  |  | Duke |  | Duke |  | Duke |  |  |  | Duke |  | Duke |  |
| Maturity |  | Interest |  | Duke |  | Energy |  | Energy |  | Energy |  |  |  | Energy |  | Energy |  |
Issuance Date | Date |  | Rate |  | Energy |  | (Parent) |  | Carolinas |  | Progress |  |  |  | Ohio |  | Indiana |  |
Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
January 2024(a) | January 2027 |  | 4.85 | % |  | $ | 600 |  |  | $ | 600 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | — |  |  |
January 2024(a) | January 2029 |  | 4.85 | % |  | 650 |  |  | 650 |  |  | — |  |  | — |  |  |  |  | — |  |  | — |  |  |
First Mortgage Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
January 2024(b) | January 2034 |  | 4.85 | % |  | $ | 575 |  |  | $ | — |  |  | $ | 575 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | — |  |  |
January 2024(b) | January 2054 |  | 5.40 | % |  | 425 |  |  | — |  |  | 425 |  |  | — |  |  |  |  | — |  |  | — |  |  |
March 2024(b) | March 2034 |  | 5.25 | % |  | 300 |  |  | — |  |  | — |  |  | — |  |  |  |  | — |  |  | 300 |  |  |
March 2024(c) | March 2034 |  | 5.10 | % |  | 500 |  |  | — |  |  | — |  |  | 500 |  |  |  |  | — |  |  | — |  |  |
March 2024(d) | March 2054 |  | 5.55 | % |  | 425 |  |  | — |  |  | — |  |  | — |  |  |  |  | 425 |  |  | — |  |  |
Total issuances |  |  |  |  | $ | 3,475 |  |  | $ | 1,250 |  |  | $ | 1,000 |  |  | $ | 500 |  |  |  |  | $ | 425 |  |  | $ | 300 |  |  |
(a)Proceeds were used to repay the remaining $1 billion outstanding on Duke Energy (Parent)'s variable rate Term Loan Facility due March 2024, pay down a portion of short-term debt and for general corporate purposes. Duke Energy (Parent)'s Term Loan Facility was terminated in March 2024 in conjunction with the payoff of remaining borrowings. (b)Proceeds were used to pay down a portion of short-term debt and for general company purposes. (c)Proceeds were used to fund eligible green energy projects, pay down a portion of short-term debt and for general company purposes. (d)Proceeds were used to pay down a portion of short-term debt and for general corporate purposes. The following table shows the significant components of Current maturities of long-term debt on the Condensed Consolidated Balance Sheets. The Duke Energy Registrants currently anticipate satisfying these obligations with cash on hand and proceeds from additional borrowings.
(in millions) | Maturity Date |  | Interest Rate |  | March 31, 2024
Unsecured Debt |  |  |  |  |
Duke Energy (Parent) | April 2024 |  | 3.750 | % |  | $ | 1,000 |
Secured Debt |  |  |  |  |
Duke Energy Florida(a) | April 2024 |  | 6.395 | % |  | 163 |
Duke Energy Florida(a) | April 2024 |  | 6.226 | % |  | 162 |
Duke Energy Carolinas(a) | January 2025 |  | 6.176 | % |  | 500 |
First Mortgage Bonds |  |  |  |  |
Duke Energy Florida(b) | October 2073 |  | 4.922 | % |  | 200 |
Other(c) |  |  |  |  | 249 |
Current maturities of long-term debt |  |  |  |  | $ | 2,274 |
(a)Debt has a floating interest rate. In April 2024, Duke Energy Florida repaid the $325 million in total borrowings outstanding under the DEFR accounts receivable securitization facility maturing in April 2024 and terminated the facility. See Note 12 for additional information. (b)While final maturity is October 2073, these first mortgage bonds are classified as Current maturities of long-term debt on the Consolidated Balance Sheets, based on terms of the indenture, which could require repayment in less than 12 months if exercised by the bondholders. (c)Includes finance lease obligations, amortizing debt, tax-exempt bonds with mandatory put options and small bullet maturities.
Schedule of Line of Credit Facilities | The table below includes the current borrowing sublimits and available capacity under these credit facilities.
| March 31, 2024
|  |  | Duke |  | Duke |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Energy |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | (Parent) |  | Carolinas |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Facility size(a) | $ | 9,000 |  |  | $ | 2,275 |  |  | $ | 1,400 |  |  | $ | 1,575 |  |  | $ | 950 |  |  | $ | 1,050 |  |  | $ | 950 |  |  | $ | 800 |
Reduction to backstop issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper(b) | (3,759) |  |  | (1,309) |  |  | (355) |  |  | (904) |  |  | (66) |  |  | (331) |  |  | (286) |  |  | (508) |
Outstanding letters of credit | (38) |  |  | (26) |  |  | (4) |  |  | (1) |  |  | (7) |  |  | — |  |  | — |  |  | — |
Tax-exempt bonds | (81) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (81) |  |  | — |
Available capacity under the Master Credit Facility | $ | 5,122 |  |  | $ | 940 |  |  | $ | 1,041 |  |  | $ | 670 |  |  | $ | 877 |  |  | $ | 719 |  |  | $ | 583 |  |  | $ | 292 |
(a)Represents the sublimit of each borrower. (b)Duke Energy issued $625 million of commercial paper and loaned the proceeds through the money pool to Duke Energy Carolinas, Duke Energy Progress, Duke Energy Ohio and Duke Energy Indiana. The balances are classified as Long-Term Debt Payable to Affiliated Companies on the Condensed Consolidated Balance Sheets.

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