Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Public Utilities, Inventory [Line Items]
Inventory	$ 3,171	$ 3,199
Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	2,455	2,397
Coal
Public Utilities, Inventory [Line Items]
Inventory	469	486
Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	247	316
Duke Energy Carolinas
Public Utilities, Inventory [Line Items]
Inventory	1,040	1,026
Duke Energy Carolinas | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	810	793
Duke Energy Carolinas | Coal
Public Utilities, Inventory [Line Items]
Inventory	196	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	1,403	1,398
Progress Energy | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	1,089	1,067
Progress Energy | Coal
Public Utilities, Inventory [Line Items]
Inventory	149	167
Progress Energy | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	165	164
Duke Energy Progress
Public Utilities, Inventory [Line Items]
Inventory	940	921
Duke Energy Progress | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	744	729
Duke Energy Progress | Coal
Public Utilities, Inventory [Line Items]
Inventory	93	94
Duke Energy Progress | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	103	98
Duke Energy Florida
Public Utilities, Inventory [Line Items]
Inventory	463	477
Duke Energy Florida | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	345	338
Duke Energy Florida | Coal
Public Utilities, Inventory [Line Items]
Inventory	56	73
Duke Energy Florida | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	62	66
Duke Energy Ohio
Public Utilities, Inventory [Line Items]
Inventory	114	116
Duke Energy Ohio | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	89	80
Duke Energy Ohio | Coal
Public Utilities, Inventory [Line Items]
Inventory	16	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	430	418
Duke Energy Indiana | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	320	311
Duke Energy Indiana | Coal
Public Utilities, Inventory [Line Items]
Inventory	108	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	51	109
Piedmont | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	14	14
Piedmont | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	$ 37	$ 95