Derivatives and Hedging (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 1,336	$ 320
Net amounts presented in Current Assets: Other	1,336	320
Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	868	204
Gross amounts offset	(331)	(25)
Net amounts presented in Current Assets: Other	537	179
Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	468	116
Gross amounts offset	(242)	(23)
Net amounts presented in Current Assets: Other	226	93
Duke Energy Carolinas
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	484	162
Net amounts presented in Current Assets: Other	484	162
Duke Energy Carolinas | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	268	99
Gross amounts offset	(193)	(16)
Net amounts presented in Current Assets: Other	75	83
Duke Energy Carolinas | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	216	63
Gross amounts offset	(125)	(15)
Net amounts presented in Current Assets: Other	91	48
Progress Energy
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	368	124
Net amounts presented in Current Assets: Other	368	124
Progress Energy | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	203	74
Gross amounts offset	(137)	(9)
Net amounts presented in Current Assets: Other	66	65
Progress Energy | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	165	50
Gross amounts offset	(117)	(8)
Net amounts presented in Current Assets: Other	48	42
Duke Energy Progress
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	368	124
Net amounts presented in Current Assets: Other	368	124
Duke Energy Progress | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	203	74
Gross amounts offset	(137)	(9)
Net amounts presented in Current Assets: Other	66	65
Duke Energy Progress | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	165	50
Gross amounts offset	(117)	(8)
Net amounts presented in Current Assets: Other	48	42
Duke Energy Ohio
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	5	2
Duke Energy Ohio | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	5	2
Net amounts presented in Current Assets: Other	5	2
Duke Energy Indiana
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	141	23
Net amounts presented in Current Assets: Other	141	23
Duke Energy Indiana | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	141	23
Net amounts presented in Current Assets: Other	$ 141	23
Piedmont
Offsetting Derivative Assets [Abstract]
Gross amounts recognized		3
Net amounts presented in Current Assets: Other		3
Piedmont | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized		3
Net amounts presented in Current Assets: Other		$ 3