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Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Total inventory | $ 4,281 | $ 4,292
Duke Energy (Parent) |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 3,130 | 3,086
Coal | 840 | 842
Natural gas, oil and other fuel | 311 | 364
Total inventory | 4,281 | 4,292
Duke Energy Carolinas |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,078 | 1,075
Coal | 357 | 364
Natural gas, oil and other fuel | 43 | 45
Total inventory | 1,478 | 1,484
Progress Energy |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,547 | 1,465
Coal | 240 | 231
Natural gas, oil and other fuel | 200 | 205
Total inventory | 1,987 | 1,901
Duke Energy Progress |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,039 | 963
Coal | 150 | 154
Natural gas, oil and other fuel | 105 | 110
Total inventory | 1,294 | 1,227
Duke Energy Florida |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 508 | 502
Coal | 90 | 77
Natural gas, oil and other fuel | 95 | 95
Total inventory | 693 | 674
Duke Energy Ohio |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 146 | 139
Coal | 27 | 28
Natural gas, oil and other fuel | 12 | 12
Total inventory | 185 | 179
Duke Energy Indiana |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 316 | 361
Coal | 216 | 219
Natural gas, oil and other fuel | 2 | 2
Total inventory | 534 | 582
Piedmont |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 12 | 12
Coal | 0 | 0
Natural gas, oil and other fuel | 53 | 100
Total inventory | $ 65 | $ 112

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