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Summary of Significant Accounting Policies (Inventory) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | $ 2,604 | $ 2,309
Coal | 620 | 486
Natural gas, oil and other | 360 | 316
Total inventory | 3,584 | 3,111
Duke Energy Carolinas |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 876 | 793
Coal | 253 | 195
Natural gas, oil and other | 35 | 38
Total inventory | 1,164 | 1,026
Progress Energy |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,232 | 1,067
Coal | 190 | 167
Natural gas, oil and other | 157 | 164
Total inventory | 1,579 | 1,398
Duke Energy Progress |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 819 | 729
Coal | 99 | 94
Natural gas, oil and other | 88 | 98
Total inventory | 1,006 | 921
Duke Energy Florida |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 413 | 338
Coal | 91 | 73
Natural gas, oil and other | 69 | 66
Total inventory | 573 | 477
Duke Energy Ohio |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 105 | 80
Coal | 34 | 19
Natural gas, oil and other | 5 | 17
Total inventory | 144 | 116
Duke Energy Indiana |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 342 | 311
Coal | 144 | 105
Natural gas, oil and other | 3 | 2
Total inventory | 489 | 418
Piedmont |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 12 | 14
Natural gas, oil and other | 160 | 95
Total inventory | $ 172 | $ 109

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