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Summary of Significant Accounting Policies (Inventory) (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | $ 3,542 | $ 3,386
Coal | 715 | 801
Natural gas, oil and other | 312 | 309
Total inventory | 4,569 | 4,496
Duke Energy Carolinas |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,157 | 1,150
Coal | 328 | 341
Natural gas, oil and other | 45 | 45
Total inventory | 1,530 | 1,536
Progress Energy |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,789 | 1,649
Coal | 235 | 241
Natural gas, oil and other | 186 | 196
Total inventory | 2,210 | 2,086
Duke Energy Progress |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,109 | 1,074
Coal | 155 | 164
Natural gas, oil and other | 99 | 103
Total inventory | 1,363 | 1,341
Duke Energy Florida |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 680 | 576
Coal | 80 | 77
Natural gas, oil and other | 87 | 92
Total inventory | 847 | 745
Duke Energy Ohio |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 155 | 149
Coal | 21 | 23
Natural gas, oil and other | 11 | 11
Total inventory | 187 | 183
Duke Energy Indiana |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 398 | 389
Coal | 131 | 196
Natural gas, oil and other | 2 | 1
Total inventory | 531 | 586
Piedmont |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 10 | 11
Coal | 0 |
Natural gas, oil and other | 67 | 55
Total inventory | $ 77 | $ 66

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