Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Public Utilities, Inventory [Line Items]
Total inventory	$ 4,281	$ 4,292
Duke Energy (Parent)
Public Utilities, Inventory [Line Items]
Materials and supplies	3,130	3,086
Coal	840	842
Natural gas, oil and other fuel	311	364
Total inventory	4,281	4,292
Duke Energy Carolinas
Public Utilities, Inventory [Line Items]
Materials and supplies	1,078	1,075
Coal	357	364
Natural gas, oil and other fuel	43	45
Total inventory	1,478	1,484
Progress Energy
Public Utilities, Inventory [Line Items]
Materials and supplies	1,547	1,465
Coal	240	231
Natural gas, oil and other fuel	200	205
Total inventory	1,987	1,901
Duke Energy Progress
Public Utilities, Inventory [Line Items]
Materials and supplies	1,039	963
Coal	150	154
Natural gas, oil and other fuel	105	110
Total inventory	1,294	1,227
Duke Energy Florida
Public Utilities, Inventory [Line Items]
Materials and supplies	508	502
Coal	90	77
Natural gas, oil and other fuel	95	95
Total inventory	693	674
Duke Energy Ohio
Public Utilities, Inventory [Line Items]
Materials and supplies	146	139
Coal	27	28
Natural gas, oil and other fuel	12	12
Total inventory	185	179
Duke Energy Indiana
Public Utilities, Inventory [Line Items]
Materials and supplies	316	361
Coal	216	219
Natural gas, oil and other fuel	2	2
Total inventory	534	582
Piedmont
Public Utilities, Inventory [Line Items]
Materials and supplies	12	12
Coal	0	0
Natural gas, oil and other fuel	53	100
Total inventory	$ 65	$ 112