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Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Total inventory | $ 4,434 | $ 4,509
Duke Energy (Parent) |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 3,403 | 3,387
Coal | 738 | 801
Natural gas, oil and other fuel | 293 | 321
Total inventory | 4,434 | 4,509
Duke Energy Carolinas |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,139 | 1,150
Coal | 339 | 341
Natural gas, oil and other fuel | 46 | 45
Total inventory | 1,524 | 1,536
Progress Energy |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,660 | 1,649
Coal | 235 | 241
Natural gas, oil and other fuel | 195 | 196
Total inventory | 2,090 | 2,086
Duke Energy Progress |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,059 | 1,074
Coal | 158 | 164
Natural gas, oil and other fuel | 106 | 103
Total inventory | 1,323 | 1,341
Duke Energy Florida |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 601 | 576
Coal | 76 | 77
Natural gas, oil and other fuel | 90 | 92
Total inventory | 767 | 745
Duke Energy Ohio |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 148 | 149
Coal | 22 | 23
Natural gas, oil and other fuel | 11 | 11
Total inventory | 181 | 183
Duke Energy Indiana |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 406 | 389
Coal | 142 | 196
Natural gas, oil and other fuel | 2 | 1
Total inventory | 550 | 586
Piedmont |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 13 | 11
Coal | 0 | 0
Natural gas, oil and other fuel | 38 | 67
Total inventory | $ 51 | $ 78

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