Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 603	$ 437
Net amounts presented in Current Liabilities: Other	235	144
Net amounts presented in Current Liabilities: Other	238	185
Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	282	193
Gross amounts offset	$ (47)	$ (49)
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current Liabilities: Other	Current Liabilities: Other
Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 321	$ 244
Gross amounts offset	$ (83)	$ (59)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other	Other
Duke Energy Carolinas
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 201	$ 127
Net amounts presented in Current Liabilities: Other	123	81
Net amounts presented in Current Liabilities: Other	15	2
Duke Energy Carolinas | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	143	96
Gross amounts offset	(20)	(15)
Duke Energy Carolinas | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	58	31
Gross amounts offset	(43)	(29)
Progress Energy
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	153	66
Net amounts presented in Current Liabilities: Other	82	18
Net amounts presented in Current Liabilities: Other	23
Progress Energy | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	90	36
Gross amounts offset	(8)	(18)
Progress Energy | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	63	30
Gross amounts offset	(40)	(30)
Duke Energy Progress
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	149	48
Net amounts presented in Current Liabilities: Other	82
Net amounts presented in Current Liabilities: Other	19
Duke Energy Progress | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	90	18
Gross amounts offset	(8)	(18)
Duke Energy Progress | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	59	30
Gross amounts offset	(40)	(30)
Duke Energy Florida
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	3	19
Net amounts presented in Current Liabilities: Other		19
Net amounts presented in Current Liabilities: Other	3
Duke Energy Florida | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		19
Duke Energy Florida | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	3
Duke Energy Ohio
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	1	2
Net amounts presented in Current Liabilities: Other	1	2
Duke Energy Ohio | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	1	2
Duke Energy Indiana
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	28	16
Net amounts presented in Current Liabilities: Other	9
Duke Energy Indiana | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	19	16
Gross amounts offset	(19)	(16)
Duke Energy Indiana | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	9
Piedmont
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	144	168
Net amounts presented in Current Liabilities: Other	12	27
Net amounts presented in Current Liabilities: Other	132	141
Piedmont | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	12	27
Piedmont | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 132	$ 141