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Summary of Significant Accounting Policies (Inventory) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | $ 2,397 | $ 2,312
Coal | 486 | 561
Natural gas, oil and other | 316 | 294
Total inventory | 3,199 | 3,167
Duke Energy Carolinas |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 793 | 785
Coal | 195 | 186
Natural gas, oil and other | 38 | 39
Total inventory | 1,026 | 1,010
Progress Energy |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,067 | 999
Coal | 167 | 193
Natural gas, oil and other | 164 | 183
Total inventory | 1,398 | 1,375
Duke Energy Progress |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 729 | 673
Coal | 94 | 131
Natural gas, oil and other | 98 | 107
Total inventory | 921 | 911
Duke Energy Florida |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 338 | 325
Coal | 73 | 63
Natural gas, oil and other | 66 | 76
Total inventory | 477 | 464
Duke Energy Ohio |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 80 | 78
Coal | 19 | 16
Natural gas, oil and other | 17 | 16
Total inventory | 116 | 110
Duke Energy Indiana |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 311 | 307
Coal | 105 | 165
Natural gas, oil and other | 2 | 1
Total inventory | 418 | 473
Piedmont |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 14 | 12
Natural gas, oil and other | 95 | 56
Total inventory | $ 109 | $ 68

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