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Organization and Basis of Presentation (Tables) | 3 Months Ended
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Mar. 31, 2024
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.
| March 31, 2024 |  | December 31, 2023
|  | 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 | $ | 459 |  | $ | 5 |  | $ | 49 |  | $ | 27 |  | $ | 4 |  |  | $ | 253 |  | $ | 9 |  | $ | 59 |  | $ | 18 |  | $ | 24 |
Other | 33 |  | 6 |  | 27 |  | 18 |  | 9 |  |  | 76 |  | 9 |  | 67 |  | 31 |  | 36 |
Other Noncurrent Assets |  |  |  |  |  |  |  |  |  |  |
Other | 17 |  | 1 |  | 10 |  | 4 |  | 7 |  |  | 16 |  | 1 |  | 9 |  | 2 |  | 7 |
Total cash, cash equivalents and restricted cash | $ | 509 |  | $ | 12 |  | $ | 86 |  | $ | 49 |  | $ | 20 |  |  | $ | 345 |  | $ | 19 |  | $ | 135 |  | $ | 51 |  | $ | 67 |
Schedule of Utility Inventory | The components of inventory are presented in the tables below.
| March 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 | $ | 3,130 |  |  | $ | 1,078 |  |  | $ | 1,547 |  |  | $ | 1,039 |  |  | $ | 508 |  |  | $ | 146 |  |  | $ | 316 |  |  | $ | 12 |
Coal | 840 |  |  | 357 |  |  | 240 |  |  | 150 |  |  | 90 |  |  | 27 |  |  | 216 |  |  | — |
Natural gas, oil and other fuel | 311 |  |  | 43 |  |  | 200 |  |  | 105 |  |  | 95 |  |  | 12 |  |  | 2 |  |  | 53 |
Total inventory | $ | 4,281 |  |  | $ | 1,478 |  |  | $ | 1,987 |  |  | $ | 1,294 |  |  | $ | 693 |  |  | $ | 185 |  |  | $ | 534 |  |  | $ | 65 |
| December 31, 2023
|  |  | 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 | $ | 3,086 |  |  | $ | 1,075 |  |  | $ | 1,465 |  |  | $ | 963 |  |  | $ | 502 |  |  | $ | 139 |  |  | $ | 361 |  |  | $ | 12 |
Coal | 842 |  |  | 364 |  |  | 231 |  |  | 154 |  |  | 77 |  |  | 28 |  |  | 219 |  |  | — |
Natural gas, oil and other fuel | 364 |  |  | 45 |  |  | 205 |  |  | 110 |  |  | 95 |  |  | 12 |  |  | 2 |  |  | 100 |
Total inventory | $ | 4,292 |  |  | $ | 1,484 |  |  | $ | 1,901 |  |  | $ | 1,227 |  |  | $ | 674 |  |  | $ | 179 |  |  | $ | 582 |  |  | $ | 112 |
Schedule of Accounts Payable Finance Programs | The following table represents the changes in confirmed obligations outstanding for the three months ended March 31, 2024, and 2023.
| Three Months Ended March 31, 2023 and 2024
|  | Duke |  | Duke | Duke | Duke | Duke |
| Duke | Energy | Progress | Energy | Energy | Energy | Energy |
(in millions) | Energy | Carolinas | Energy | Progress | Florida | Ohio | Indiana | Piedmont
Confirmed obligations outstanding at December 31, 2022 | $ | 87 |  | $ | 6 |  | $ | 19 |  | $ | 8 |  | $ | 11 |  | $ | 5 |  | $ | — |  | $ | 57 |
Invoices confirmed during the period | 59 |  | 10 |  | 22 |  | 11 |  | 11 |  | 1 |  | — |  | 25 |
Confirmed invoices paid during the period | (94) |  | (9) |  | (26) |  | (13) |  | (13) |  | (6) |  | — |  | (53) |
Confirmed obligations outstanding at March 31, 2023 | $ | 52 |  | $ | 7 |  | $ | 15 |  | $ | 6 |  | $ | 9 |  | $ | — |  | $ | — |  | $ | 29 |
Confirmed obligations outstanding at December 31, 2023 | $ | 50 |  | $ | — |  | $ | 3 |  | $ | — |  | $ | 3 |  | $ | — |  | $ | — |  | $ | 47 |
Invoices confirmed during the period | 57 |  | — |  | 1 |  | — |  | 1 |  | — |  | — |  | 56 |
Confirmed invoices paid during the period | (31) |  | — |  | (2) |  | — |  | (2) |  | — |  | — |  | (29) |
Confirmed obligations outstanding at March 31, 2024 | $ | 76 |  | $ | — |  | $ | 2 |  | $ | — |  | $ | 2 |  | $ | — |  | $ | — |  | $ | 74 |

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