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Summary of Significant Accounting Policies (Inventory) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | $ 3,387 | $ 3,086
Coal | 801 | 842
Natural gas, oil and other | 321 | 364
Total inventory | 4,509 | 4,292
Duke Energy Carolinas |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,150 | 1,075
Coal | 341 | 364
Natural gas, oil and other | 45 | 45
Total inventory | 1,536 | 1,484
Progress Energy |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,649 | 1,465
Coal | 241 | 231
Natural gas, oil and other | 196 | 205
Total inventory | 2,086 | 1,901
Duke Energy Progress |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,074 | 963
Coal | 164 | 154
Natural gas, oil and other | 103 | 110
Total inventory | 1,341 | 1,227
Duke Energy Florida |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 576 | 502
Coal | 77 | 77
Natural gas, oil and other | 92 | 95
Total inventory | 745 | 674
Duke Energy Ohio |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 149 | 139
Coal | 23 | 28
Natural gas, oil and other | 11 | 12
Total inventory | 183 | 179
Duke Energy Indiana |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 389 | 361
Coal | 196 | 219
Natural gas, oil and other | 1 | 2
Total inventory | 586 | 582
Piedmont |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 11 | 12
Natural gas, oil and other | 67 | 100
Total inventory | $ 78 | $ 112

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