Derivatives and Hedging (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 1,108	$ 320
Net amounts presented in Current Assets: Other	1,108	320
Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	767	204
Gross amounts offset	(255)	(25)
Net amounts presented in Current Assets: Other	512	179
Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	341	116
Gross amounts offset	(115)	(23)
Net amounts presented in Current Assets: Other	226	93
Duke Energy Carolinas
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	493	162
Net amounts presented in Current Assets: Other	493	162
Duke Energy Carolinas | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	335	99
Gross amounts offset	(149)	(16)
Net amounts presented in Current Assets: Other	186	83
Duke Energy Carolinas | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	158	63
Gross amounts offset	(64)	(15)
Net amounts presented in Current Assets: Other	94	48
Progress Energy
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	425	124
Net amounts presented in Current Assets: Other	425	124
Progress Energy | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	295	74
Gross amounts offset	(106)	(9)
Net amounts presented in Current Assets: Other	189	65
Progress Energy | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	130	50
Gross amounts offset	(51)	(8)
Net amounts presented in Current Assets: Other	79	42
Duke Energy Progress
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	385	124
Net amounts presented in Current Assets: Other	385	124
Duke Energy Progress | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	255	74
Gross amounts offset	(106)	(9)
Net amounts presented in Current Assets: Other	149	65
Duke Energy Progress | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	130	50
Gross amounts offset	(51)	(8)
Net amounts presented in Current Assets: Other	79	42
Duke Energy Florida
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	40
Net amounts presented in Current Assets: Other	40
Duke Energy Florida | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	40
Net amounts presented in Current Assets: Other	40
Duke Energy Ohio
Offsetting Derivative Assets [Abstract]
Gross amounts recognized		2
Duke Energy Ohio | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized		2
Net amounts presented in Current Assets: Other		2
Duke Energy Indiana
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	45	23
Net amounts presented in Current Assets: Other	45	23
Duke Energy Indiana | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	28	23
Net amounts presented in Current Assets: Other	28	23
Duke Energy Indiana | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	17
Net amounts presented in Current Assets: Other	17
Piedmont
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	7	3
Net amounts presented in Current Assets: Other	7	3
Piedmont | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	7	3
Net amounts presented in Current Assets: Other	$ 7	$ 3