Derivatives and Hedging (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 1,259	$ 320
Derivative Asset, Current	571	179
Net amounts presented in Current Assets: Other	265	93
Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	803	204
Gross amounts offset	$ (232)	$ (25)
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]	Current Assets: Other	Current Assets: Other
Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 456	$ 116
Gross amounts offset	$ (191)	$ (23)
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Noncurrent Assets: Other	Other Noncurrent Assets: Other
Duke Energy Carolinas
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 535	$ 162
Derivative Asset, Current	158	83
Net amounts presented in Current Assets: Other	167	48
Duke Energy Carolinas \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	282	99
Gross amounts offset	(124)	(16)
Duke Energy Carolinas \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	253	63
Gross amounts offset	(86)	(15)
Progress Energy
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	437	124
Derivative Asset, Current	166	65
Net amounts presented in Current Assets: Other	57	42
Progress Energy \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	275	74
Gross amounts offset	(109)	(9)
Progress Energy \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	162	50
Gross amounts offset	(105)	(8)
Duke Energy Progress
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	415	124
Derivative Asset, Current	144	65
Net amounts presented in Current Assets: Other	57	42
Duke Energy Progress \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	253	74
Gross amounts offset	(109)	(9)
Duke Energy Progress \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	162	50
Gross amounts offset	(105)	(8)
Duke Energy Florida
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	22
Derivative Asset, Current	22
Duke Energy Florida \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	22
Duke Energy Ohio
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	4	2
Derivative Asset, Current	4	2
Duke Energy Ohio \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	4	2
Duke Energy Indiana
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	131	23
Derivative Asset, Current	131	23
Duke Energy Indiana \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 131	23
Piedmont
Offsetting Derivative Assets [Abstract]
Gross amounts recognized		3
Derivative Asset, Current		3
Piedmont \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized		$ 3

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