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Summary of Significant Accounting Policies (Inventory) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | $ 3,086 | $ 2,604
Coal | 842 | 620
Natural gas, oil and other | 364 | 360
Total inventory | 4,292 | 3,584
Duke Energy Carolinas |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,075 | 876
Coal | 364 | 253
Natural gas, oil and other | 45 | 35
Total inventory | 1,484 | 1,164
Progress Energy |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,465 | 1,232
Coal | 231 | 190
Natural gas, oil and other | 205 | 157
Total inventory | 1,901 | 1,579
Duke Energy Progress |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 963 | 819
Coal | 154 | 99
Natural gas, oil and other | 110 | 88
Total inventory | 1,227 | 1,006
Duke Energy Florida |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 502 | 413
Coal | 77 | 91
Natural gas, oil and other | 95 | 69
Total inventory | 674 | 573
Duke Energy Ohio |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 139 | 105
Coal | 28 | 34
Natural gas, oil and other | 12 | 5
Total inventory | 179 | 144
Duke Energy Indiana |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 361 | 342
Coal | 219 | 144
Natural gas, oil and other | 2 | 3
Total inventory | 582 | 489
Piedmont |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 12 | 12
Natural gas, oil and other | 100 | 160
Total inventory | $ 112 | $ 172

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