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Organization and Basis of Presentation (Tables) | 6 Months Ended
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Jun. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Cash, Cash Equivalents and Restricted Cash | The following table presents the components of cash, cash equivalents and restricted cash included in the Condensed Consolidated Balance Sheets.
| June 30, 2025 |  | December 31, 2024
|  | Duke |  | Duke | Duke |  |  | Duke |  | Duke | Duke
| Duke | Energy | Progress | Energy | Energy |  | Duke | Energy | Progress | Energy | Energy
| Energy | Carolinas | Energy | Progress | Florida |  | Energy | Carolinas | Energy | Progress | Florida
Current Assets |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 344 |  | $ | 7 |  | $ | 58 |  | $ | 24 |  | $ | 16 |  |  | $ | 314 |  | $ | 6 |  | $ | 73 |  | $ | 24 |  | $ | 33 |
Other | 75 |  | 9 |  | 66 |  | 37 |  | 28 |  |  | 84 |  | 9 |  | 76 |  | 40 |  | 35 |
Other Noncurrent Assets |  |  |  |  |  |  |  |  |  |  |
Other | 23 |  | 1 |  | 11 |  | 5 |  | 7 |  |  | 20 |  | 1 |  | 11 |  | 5 |  | 7 |
Total cash, cash equivalents and restricted cash | $ | 442 |  | $ | 17 |  | $ | 135 |  | $ | 66 |  | $ | 51 |  |  | $ | 418 |  | $ | 16 |  | $ | 160 |  | $ | 69 |  | $ | 75 |
Schedule of Utility Inventory | The components of inventory are presented in the tables below.
| June 30, 2025
|  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Materials and supplies | $ | 3,403 |  |  | $ | 1,139 |  |  | $ | 1,660 |  |  | $ | 1,059 |  |  | $ | 601 |  |  | $ | 148 |  |  | $ | 406 |  |  | $ | 13 |
Coal | 738 |  |  | 339 |  |  | 235 |  |  | 158 |  |  | 76 |  |  | 22 |  |  | 142 |  |  | — |
Natural gas, oil and other fuel | 293 |  |  | 46 |  |  | 195 |  |  | 106 |  |  | 90 |  |  | 11 |  |  | 2 |  |  | 38 |
Total inventory | $ | 4,434 |  |  | $ | 1,524 |  |  | $ | 2,090 |  |  | $ | 1,323 |  |  | $ | 767 |  |  | $ | 181 |  |  | $ | 550 |  |  | $ | 51 |
| December 31, 2024
|  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Materials and supplies | $ | 3,387 |  |  | $ | 1,150 |  |  | $ | 1,649 |  |  | $ | 1,074 |  |  | $ | 576 |  |  | $ | 149 |  |  | $ | 389 |  |  | $ | 11 |
Coal | 801 |  |  | 341 |  |  | 241 |  |  | 164 |  |  | 77 |  |  | 23 |  |  | 196 |  |  | — |
Natural gas, oil and other fuel | 321 |  |  | 45 |  |  | 196 |  |  | 103 |  |  | 92 |  |  | 11 |  |  | 1 |  |  | 67 |
Total inventory | $ | 4,509 |  |  | $ | 1,536 |  |  | $ | 2,086 |  |  | $ | 1,341 |  |  | $ | 745 |  |  | $ | 183 |  |  | $ | 586 |  |  | $ | 78 |
Schedule of Accounts Payable Finance Program | The following table presents the amounts included within Accounts payable on the Condensed Consolidated Balance Sheets sold to the financial institution by our suppliers and the supplier invoices sold to the financial institution under the program included within Net cash provided by operating activities on the Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2025, and 2024.
| Three Months Ended June 30, 2024 and 2025
| Duke |  |  |  |  |  |  |
(in millions) | Energy |  |  |  |  |  |  | Piedmont
Confirmed obligations outstanding at March 31, 2024 | $ | 76 |  |  |  |  |  |  |  | $ | 74 |
Invoices confirmed during the period | 63 |  |  |  |  |  |  |  | 63 |
Confirmed invoices paid during the period | (111) |  |  |  |  |  |  |  | (109) |
Confirmed obligations outstanding at June 30, 2024 | $ | 28 |  |  |  |  |  |  |  | $ | 28 |
Confirmed obligations outstanding at March 31, 2025 | $ | 18 |  |  |  |  |  |  |  | $ | 18 |
Invoices confirmed during the period | 14 |  |  |  |  |  |  |  | 12 |
Confirmed invoices paid during the period | (20) |  |  |  |  |  |  |  | (18) |
Confirmed obligations outstanding at June 30, 2025 | $ | 12 |  |  |  |  |  |  |  | $ | 12 |
| Six Months Ended June 30, 2024 and 2025
| Duke |  |  |  |  |  |  |
(in millions) | Energy |  |  |  |  |  |  | Piedmont
Confirmed obligations outstanding at December 31, 2023 | $ | 50 |  |  |  |  |  |  |  | $ | 47 |
Invoices confirmed during the period | 120 |  |  |  |  |  |  |  | 119 |
Confirmed invoices paid during the period | (142) |  |  |  |  |  |  |  | (138) |
Confirmed obligations outstanding at June 30, 2024 | $ | 28 |  |  |  |  |  |  |  | $ | 28 |
Confirmed obligations outstanding at December 31, 2024 | $ | 13 |  |  |  |  |  |  |  | $ | 12 |
Invoices confirmed during the period | 32 |  |  |  |  |  |  |  | 30 |
Confirmed invoices paid during the period | (33) |  |  |  |  |  |  |  | (30) |
Confirmed obligations outstanding at June 30, 2025 | $ | 12 |  |  |  |  |  |  |  | $ | 12 |

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