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Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Inventory | $ 3,140 | $ 3,250
Materials and supplies [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 2,283 | 2,293
Coal [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 515 | 603
Natural gas, oil and other fuel [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 342 | 354
Duke Energy Carolinas [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 976 | 971
Duke Energy Carolinas [Member] | Materials and supplies [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 758 | 744
Duke Energy Carolinas [Member] | Coal [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 176 | 192
Duke Energy Carolinas [Member] | Natural gas, oil and other fuel [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 42 | 35
Progress Energy [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 1,473 | 1,592
Progress Energy [Member] | Materials and supplies [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 1,071 | 1,118
Progress Energy [Member] | Coal [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 187 | 255
Progress Energy [Member] | Natural gas, oil and other fuel [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 215 | 219
Duke Energy Progress [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 956 | 1,017
Duke Energy Progress [Member] | Materials and supplies [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 748 | 774
Duke Energy Progress [Member] | Coal [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 99 | 139
Duke Energy Progress [Member] | Natural gas, oil and other fuel [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 109 | 104
Duke Energy Florida [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 517 | 574
Duke Energy Florida [Member] | Materials and supplies [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 323 | 343
Duke Energy Florida [Member] | Coal [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 88 | 116
Duke Energy Florida [Member] | Natural gas, oil and other fuel [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 106 | 115
Duke Energy Ohio [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 135 | 133
Duke Energy Ohio [Member] | Materials and supplies [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 87 | 82
Duke Energy Ohio [Member] | Coal [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 14 | 17
Duke Energy Ohio [Member] | Natural gas, oil and other fuel [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 34 | 34
Duke Energy Indiana [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 434 | 450
Duke Energy Indiana [Member] | Materials and supplies [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 294 | 309
Duke Energy Indiana [Member] | Coal [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 138 | 139
Duke Energy Indiana [Member] | Natural gas, oil and other fuel [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 2 | 2
Piedmont Natural Gas [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 51 | 66
Piedmont Natural Gas [Member] | Materials and supplies [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 1 | 2
Piedmont Natural Gas [Member] | Natural gas, oil and other fuel [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | $ 50 | $ 64

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