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Summary of Significant Accounting Policies (Inventory) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | $ 2,312 | $ 2,297
Coal | 561 | 586
Natural gas, oil, other | 294 | 349
Total inventory | 3,167 | 3,232
Duke Energy Carolinas |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 785 | 768
Coal | 186 | 187
Natural gas, oil, other | 39 | 41
Total inventory | 1,010 | 996
Progress Energy |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 999 | 1,038
Coal | 193 | 186
Natural gas, oil, other | 183 | 199
Total inventory | 1,375 | 1,423
Duke Energy Progress |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 673 | 686
Coal | 131 | 138
Natural gas, oil, other | 107 | 110
Total inventory | 911 | 934
Duke Energy Florida |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 325 | 351
Coal | 63 | 48
Natural gas, oil, other | 76 | 90
Total inventory | 464 | 489
Duke Energy Ohio |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 78 | 79
Coal | 16 | 15
Natural gas, oil, other | 16 | 41
Total inventory | 110 | 135
Duke Energy Indiana |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 307 | 318
Coal | 165 | 198
Natural gas, oil, other | 1 | 1
Total inventory | 473 | 517
Piedmont |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 12 | 5
Natural gas, oil, other | 56 | 67
Total inventory | $ 68 | $ 72

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