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Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Total inventory | $ 4,494 | $ 4,496
Duke Energy (Parent) |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 3,482 | 3,386
Coal | 718 | 801
Natural gas, oil and other fuel | 294 | 309
Total inventory | 4,494 | 4,496
Duke Energy Carolinas |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,172 | 1,150
Coal | 328 | 341
Natural gas, oil and other fuel | 45 | 45
Total inventory | 1,545 | 1,536
Progress Energy |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,708 | 1,649
Coal | 249 | 241
Natural gas, oil and other fuel | 194 | 196
Total inventory | 2,151 | 2,086
Duke Energy Progress |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,106 | 1,074
Coal | 170 | 164
Natural gas, oil and other fuel | 104 | 103
Total inventory | 1,380 | 1,341
Duke Energy Florida |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 602 | 576
Coal | 79 | 77
Natural gas, oil and other fuel | 90 | 92
Total inventory | 771 | 745
Duke Energy Ohio |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 153 | 149
Coal | 18 | 23
Natural gas, oil and other fuel | 11 | 11
Total inventory | 182 | 183
Duke Energy Indiana |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 402 | 389
Coal | 123 | 196
Natural gas, oil and other fuel | 2 | 1
Total inventory | 527 | 586
Piedmont |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 13 | 11
Coal | 0 | 0
Natural gas, oil and other fuel | 41 | 55
Total inventory | $ 54 | $ 66

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