Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Public Utilities, Inventory [Line Items]
Inventory	$ 4,118	$ 3,584
Duke Energy (Parent)
Public Utilities, Inventory [Line Items]
Materials and supplies	3,018	2,604
Coal	758	620
Natural gas, oil and other fuel	342	360
Inventory	4,118	3,584
Duke Energy Carolinas
Public Utilities, Inventory [Line Items]
Materials and supplies	1,045	876
Coal	330	253
Natural gas, oil and other fuel	47	35
Inventory	1,422	1,164
Progress Energy
Public Utilities, Inventory [Line Items]
Materials and supplies	1,408	1,232
Coal	187	190
Natural gas, oil and other fuel	208	157
Inventory	1,803	1,579
Duke Energy Progress
Public Utilities, Inventory [Line Items]
Materials and supplies	920	819
Coal	110	99
Natural gas, oil and other fuel	111	88
Inventory	1,141	1,006
Duke Energy Florida
Public Utilities, Inventory [Line Items]
Materials and supplies	488	413
Coal	77	91
Natural gas, oil and other fuel	97	69
Inventory	662	573
Duke Energy Ohio
Public Utilities, Inventory [Line Items]
Materials and supplies	132	105
Coal	24	34
Natural gas, oil and other fuel	12	5
Inventory	168	144
Duke Energy Indiana
Public Utilities, Inventory [Line Items]
Materials and supplies	381	342
Coal	217	144
Natural gas, oil and other fuel	2	3
Inventory	600	489
Piedmont
Public Utilities, Inventory [Line Items]
Materials and supplies	15	12
Natural gas, oil and other fuel	73	160
Inventory	$ 88	$ 172