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Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Inventory | $ 4,100 | $ 3,584
Duke Energy Carolinas |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,012 | 876
Coal | 345 | 253
Natural gas, oil and other fuel | 46 | 35
Inventory | 1,403 | 1,164
Progress Energy |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,359 | 1,232
Coal | 251 | 190
Natural gas, oil and other fuel | 207 | 157
Inventory | 1,817 | 1,579
Duke Energy Progress |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 905 | 819
Coal | 149 | 99
Natural gas, oil and other fuel | 110 | 88
Inventory | 1,164 | 1,006
Duke Energy Florida |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 454 | 413
Coal | 102 | 91
Natural gas, oil and other fuel | 97 | 69
Inventory | 653 | 573
Duke Energy Ohio |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 131 | 105
Coal | 35 | 34
Natural gas, oil and other fuel | 12 | 5
Inventory | 178 | 144
Duke Energy Indiana |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 372 | 342
Coal | 219 | 144
Natural gas, oil and other fuel | 2 | 3
Inventory | 593 | 489
Piedmont |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 14 | 12
Natural gas, oil and other fuel | 59 | 160
Inventory | 73 | 172
Duke Energy (Parent) |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 2,924 | 2,604
Coal | 850 | 620
Natural gas, oil and other fuel | 326 | 360
Inventory | $ 4,100 | $ 3,584

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