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v3.19.3.a.u2

Summary of Significant Accounting Policies (Inventory) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | $ 2,297 | $ 2,238
Coal | 586 | 491
Natural gas, oil, other | 349 | 355
Total inventory | 3,232 | 3,084
Duke Energy Carolinas |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 768 | 731
Coal | 187 | 175
Natural gas, oil, other | 41 | 42
Total inventory | 996 | 948
Progress Energy |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 1,038 | 1,049
Coal | 186 | 192
Natural gas, oil, other | 199 | 218
Total inventory | 1,423 | 1,459
Duke Energy Progress |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 686 | 734
Coal | 138 | 106
Natural gas, oil, other | 110 | 114
Total inventory | 934 | 954
Duke Energy Florida |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 351 | 315
Coal | 48 | 86
Natural gas, oil, other | 90 | 103
Total inventory | 489 | 504
Duke Energy Ohio |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 79 | 84
Coal | 15 | 14
Natural gas, oil, other | 41 | 28
Total inventory | 135 | 126
Duke Energy Indiana |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 318 | 312
Coal | 198 | 109
Natural gas, oil, other | 1 | 1
Total inventory | 517 | 422
Piedmont |  |
Public Utilities, Inventory [Line Items] |  |
Materials and supplies | 5 | 2
Natural gas, oil, other | 67 | 68
Total inventory | $ 72 | $ 70

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