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Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Total inventory | $ 4,390 | $ 4,292
Duke Energy (Parent) |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 3,254 | 3,086
Coal | 846 | 842
Natural gas, oil and other fuel | 290 | 364
Total inventory | 4,390 | 4,292
Duke Energy Carolinas |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,094 | 1,075
Coal | 372 | 364
Natural gas, oil and other fuel | 43 | 45
Total inventory | 1,509 | 1,484
Progress Energy |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,588 | 1,465
Coal | 233 | 231
Natural gas, oil and other fuel | 198 | 205
Total inventory | 2,019 | 1,901
Duke Energy Progress |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,051 | 963
Coal | 146 | 154
Natural gas, oil and other fuel | 106 | 110
Total inventory | 1,303 | 1,227
Duke Energy Florida |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 537 | 502
Coal | 87 | 77
Natural gas, oil and other fuel | 92 | 95
Total inventory | 716 | 674
Duke Energy Ohio |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 150 | 139
Coal | 29 | 28
Natural gas, oil and other fuel | 12 | 12
Total inventory | 191 | 179
Duke Energy Indiana |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 373 | 361
Coal | 212 | 219
Natural gas, oil and other fuel | 2 | 2
Total inventory | 587 | 582
Piedmont |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 12 | 12
Coal | 0 | 0
Natural gas, oil and other fuel | 35 | 100
Total inventory | $ 47 | $ 112

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