Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Public Utilities, Inventory [Line Items]
Materials and supplies	$ 2,739	$ 2,604
Coal	772	620
Natural gas, oil and other fuel	354	360
Inventory	3,865	3,584
Duke Energy Carolinas
Public Utilities, Inventory [Line Items]
Materials and supplies	948	876
Coal	309	253
Natural gas, oil and other fuel	46	35
Inventory	1,303	1,164
Progress Energy
Public Utilities, Inventory [Line Items]
Materials and supplies	1,273	1,232
Coal	233	190
Natural gas, oil and other fuel	206	157
Inventory	1,712	1,579
Duke Energy Progress
Public Utilities, Inventory [Line Items]
Materials and supplies	842	819
Coal	128	99
Natural gas, oil and other fuel	112	88
Inventory	1,082	1,006
Duke Energy Florida
Public Utilities, Inventory [Line Items]
Materials and supplies	431	413
Coal	105	91
Natural gas, oil and other fuel	94	69
Inventory	630	573
Duke Energy Ohio
Public Utilities, Inventory [Line Items]
Materials and supplies	116	105
Coal	29	34
Natural gas, oil and other fuel	12	5
Inventory	157	144
Duke Energy Indiana
Public Utilities, Inventory [Line Items]
Materials and supplies	355	342
Coal	202	144
Natural gas, oil and other fuel	3	3
Inventory	560	489
Piedmont
Public Utilities, Inventory [Line Items]
Materials and supplies	12	12
Natural gas, oil and other fuel	87	160
Inventory	$ 99	$ 172