Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Public Utilities, Inventory [Line Items]
Inventory	$ 4,100	$ 3,584
Duke Energy Carolinas
Public Utilities, Inventory [Line Items]
Materials and supplies	1,012	876
Coal	345	253
Natural gas, oil and other fuel	46	35
Inventory	1,403	1,164
Progress Energy
Public Utilities, Inventory [Line Items]
Materials and supplies	1,359	1,232
Coal	251	190
Natural gas, oil and other fuel	207	157
Inventory	1,817	1,579
Duke Energy Progress
Public Utilities, Inventory [Line Items]
Materials and supplies	905	819
Coal	149	99
Natural gas, oil and other fuel	110	88
Inventory	1,164	1,006
Duke Energy Florida
Public Utilities, Inventory [Line Items]
Materials and supplies	454	413
Coal	102	91
Natural gas, oil and other fuel	97	69
Inventory	653	573
Duke Energy Ohio
Public Utilities, Inventory [Line Items]
Materials and supplies	131	105
Coal	35	34
Natural gas, oil and other fuel	12	5
Inventory	178	144
Duke Energy Indiana
Public Utilities, Inventory [Line Items]
Materials and supplies	372	342
Coal	219	144
Natural gas, oil and other fuel	2	3
Inventory	593	489
Piedmont
Public Utilities, Inventory [Line Items]
Materials and supplies	14	12
Natural gas, oil and other fuel	59	160
Inventory	73	172
Duke Energy (Parent)
Public Utilities, Inventory [Line Items]
Materials and supplies	2,924	2,604
Coal	850	620
Natural gas, oil and other fuel	326	360
Inventory	$ 4,100	$ 3,584