Derivatives and Hedging (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 162	$ 189
Derivative Asset, Current	22	59
Net amounts presented in Current Assets: Other	99	91
Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	37	61
Offset	$ (15)	$ (2)
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]	Current Assets: Other	Current Assets: Other
Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 125	$ 128
Offset	$ (26)	$ (37)
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other	Other
Duke Energy Carolinas
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 26	$ 35
Derivative Asset, Current	2	5
Net amounts presented in Current Assets: Other	6	15
Duke Energy Carolinas \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	10	6
Offset	(8)	(1)
Duke Energy Carolinas \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	16	29
Offset	(10)	(14)
Progress Energy
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	33	34
Derivative Asset, Current	1	2
Net amounts presented in Current Assets: Other	9	9
Progress Energy \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	8	3
Offset	(7)	(1)
Progress Energy \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	25	31
Offset	(16)	(22)
Duke Energy Progress
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	33	32
Derivative Asset, Current	1	0
Net amounts presented in Current Assets: Other	9	9
Duke Energy Progress \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	8	1
Offset	(7)	(1)
Duke Energy Progress \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	25	31
Offset	(16)	(22)
Duke Energy Florida
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	2
Derivative Asset, Current	0	2
Net amounts presented in Current Assets: Other	0	0
Duke Energy Florida \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	2
Offset	0	0
Duke Energy Florida \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	0
Offset	0	0
Duke Energy Ohio
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	2	1
Derivative Asset, Current	2	1
Net amounts presented in Current Assets: Other	0	0
Duke Energy Ohio \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	2	1
Offset	0	0
Duke Energy Ohio \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	0
Offset	0	0
Duke Energy Indiana
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	26	25
Derivative Asset, Current	16	18
Net amounts presented in Current Assets: Other	10	7
Duke Energy Indiana \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	16	18
Offset	0	0
Duke Energy Indiana \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	10	7
Offset	0	0
Piedmont
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	2	1
Derivative Asset, Current	2	1
Net amounts presented in Current Assets: Other	0	0
Piedmont \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	2	1
Offset	0	0
Piedmont \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	0
Offset	$ 0	$ 0

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