Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Public Utilities, Inventory [Line Items]
Inventory	$ 3,487	$ 3,199
Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	2,583	2,397
Coal
Public Utilities, Inventory [Line Items]
Inventory	556	486
Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	348	316
Duke Energy Carolinas
Public Utilities, Inventory [Line Items]
Inventory	1,112	1,026
Duke Energy Carolinas | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	863	793
Duke Energy Carolinas | Coal
Public Utilities, Inventory [Line Items]
Inventory	215	195
Duke Energy Carolinas | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	34	38
Progress Energy
Public Utilities, Inventory [Line Items]
Inventory	1,549	1,398
Progress Energy | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	1,167	1,067
Progress Energy | Coal
Public Utilities, Inventory [Line Items]
Inventory	202	167
Progress Energy | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	180	164
Duke Energy Progress
Public Utilities, Inventory [Line Items]
Inventory	980	921
Duke Energy Progress | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	786	729
Duke Energy Progress | Coal
Public Utilities, Inventory [Line Items]
Inventory	87	94
Duke Energy Progress | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	107	98
Duke Energy Florida
Public Utilities, Inventory [Line Items]
Inventory	569	477
Duke Energy Florida | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	381	338
Duke Energy Florida | Coal
Public Utilities, Inventory [Line Items]
Inventory	115	73
Duke Energy Florida | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	73	66
Duke Energy Ohio
Public Utilities, Inventory [Line Items]
Inventory	118	116
Duke Energy Ohio | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	91	80
Duke Energy Ohio | Coal
Public Utilities, Inventory [Line Items]
Inventory	18	19
Duke Energy Ohio | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	9	17
Duke Energy Indiana
Public Utilities, Inventory [Line Items]
Inventory	452	418
Duke Energy Indiana | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	329	311
Duke Energy Indiana | Coal
Public Utilities, Inventory [Line Items]
Inventory	121	105
Duke Energy Indiana | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	2	2
Piedmont
Public Utilities, Inventory [Line Items]
Inventory	135	109
Piedmont | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	13	14
Piedmont | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	$ 122	$ 95