Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 509	$ 437
Net amounts presented in Current Liabilities: Other	209	144
Net amounts presented in Current Liabilities: Other	178	185
Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	251	193
Gross amounts offset	$ (42)	$ (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	$ 258	$ 244
Gross amounts offset	$ (80)	$ (59)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other	Other
Duke Energy Carolinas
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 183	$ 127
Net amounts presented in Current Liabilities: Other	97	81
Net amounts presented in Current Liabilities: Other	19	2
Duke Energy Carolinas | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	121	96
Gross amounts offset	(24)	(15)
Duke Energy Carolinas | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	62	31
Gross amounts offset	(43)	(29)
Progress Energy
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	146	66
Net amounts presented in Current Liabilities: Other	74	18
Net amounts presented in Current Liabilities: Other	23
Progress Energy | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	86	36
Gross amounts offset	(12)	(18)
Progress Energy | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	60	30
Gross amounts offset	(37)	(30)
Duke Energy Progress
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	146	48
Net amounts presented in Current Liabilities: Other	74
Net amounts presented in Current Liabilities: Other	23
Duke Energy Progress | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	86	18
Gross amounts offset	(12)	(18)
Duke Energy Progress | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	60	30
Gross amounts offset	(37)	(30)
Duke Energy Florida
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		19
Net amounts presented in Current Liabilities: Other		19
Duke Energy Florida | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		19
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	7	16
Net amounts presented in Current Liabilities: Other	1
Duke Energy Indiana | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	6	16
Gross amounts offset	(6)	(16)
Duke Energy Indiana | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	1
Piedmont
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	156	168
Net amounts presented in Current Liabilities: Other	23	27
Net amounts presented in Current Liabilities: Other	133	141
Piedmont | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	23	27
Piedmont | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 133	$ 141