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Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Inventory | $ 3,177 | $ 3,250
Materials and supplies [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 2,293 | 2,293
Coal [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 562 | 603
Natural gas, oil and other fuel [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 322 | 354
Duke Energy Carolinas [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 984 | 971
Duke Energy Carolinas [Member] | Materials and supplies [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 769 | 744
Duke Energy Carolinas [Member] | Coal [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 173 | 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 | 1,521 | 1,592
Progress Energy [Member] | Materials and supplies [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 1,085 | 1,118
Progress Energy [Member] | Coal [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 218 | 255
Progress Energy [Member] | Natural gas, oil and other fuel [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 218 | 219
Duke Energy Progress [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 976 | 1,017
Duke Energy Progress [Member] | Materials and supplies [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 757 | 774
Duke Energy Progress [Member] | Coal [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 109 | 139
Duke Energy Progress [Member] | Natural gas, oil and other fuel [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 110 | 104
Duke Energy Florida [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 546 | 574
Duke Energy Florida [Member] | Materials and supplies [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 328 | 343
Duke Energy Florida [Member] | Coal [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 109 | 116
Duke Energy Florida [Member] | Natural gas, oil and other fuel [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 109 | 115
Duke Energy Ohio [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 124 | 133
Duke Energy Ohio [Member] | Materials and supplies [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 84 | 82
Duke Energy Ohio [Member] | Coal [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 15 | 17
Duke Energy Ohio [Member] | Natural gas, oil and other fuel [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 25 | 34
Duke Energy Indiana [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 470 | 450
Duke Energy Indiana [Member] | Materials and supplies [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 313 | 309
Duke Energy Indiana [Member] | Coal [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 155 | 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 | 38 | 66
Piedmont Natural Gas [Member] | Materials and supplies [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | 2 | 2
Piedmont Natural Gas [Member] | Natural gas, oil and other fuel [Member] |  |
Public Utilities, Inventory [Line Items] |  |
Inventory | $ 36 | $ 64

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