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Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Inventory | $ 4,118 | $ 3,584
Duke Energy (Parent) |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 3,018 | 2,604
Coal | 758 | 620
Natural gas, oil and other fuel | 342 | 360
Inventory | 4,118 | 3,584
Duke Energy Carolinas |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,045 | 876
Coal | 330 | 253
Natural gas, oil and other fuel | 47 | 35
Inventory | 1,422 | 1,164
Progress Energy |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,408 | 1,232
Coal | 187 | 190
Natural gas, oil and other fuel | 208 | 157
Inventory | 1,803 | 1,579
Duke Energy Progress |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 920 | 819
Coal | 110 | 99
Natural gas, oil and other fuel | 111 | 88
Inventory | 1,141 | 1,006
Duke Energy Florida |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 488 | 413
Coal | 77 | 91
Natural gas, oil and other fuel | 97 | 69
Inventory | 662 | 573
Duke Energy Ohio |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 132 | 105
Coal | 24 | 34
Natural gas, oil and other fuel | 12 | 5
Inventory | 168 | 144
Duke Energy Indiana |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 381 | 342
Coal | 217 | 144
Natural gas, oil and other fuel | 2 | 3
Inventory | 600 | 489
Piedmont |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 15 | 12
Natural gas, oil and other fuel | 73 | 160
Inventory | $ 88 | $ 172

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