Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 520	$ 437
Net amounts presented in Current Liabilities: Other	260	144
Net amounts presented in Current Liabilities: Other	159	185
Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	293	193
Offset	(17)	$ (33)
Cash collateral posted	$ (16)
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current Liabilities: Other	Current Liabilities: Other
Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 227	$ 244
Offset	(60)	(59)
Cash collateral posted	$ (8)	$ (16)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other (includes $54 at 2023 related to VIEs)	Other (includes $54 at 2023 related to VIEs)
Duke Energy Carolinas
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 204	$ 127
Net amounts presented in Current Liabilities: Other	135	81
Net amounts presented in Current Liabilities: Other	8	2
Duke Energy Carolinas \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	156	96
Offset	(9)	(15)
Cash collateral posted	(12)
Duke Energy Carolinas \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	48	31
Offset	(33)	(29)
Cash collateral posted	(7)
Progress Energy
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	137	66
Net amounts presented in Current Liabilities: Other	88	18
Net amounts presented in Current Liabilities: Other	11
Progress Energy \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	97	36
Offset	(8)	(18)
Cash collateral posted	(1)
Progress Energy \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	40	30
Offset	(28)	(30)
Cash collateral posted	(1)
Duke Energy Progress
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	137	48
Net amounts presented in Current Liabilities: Other	88
Net amounts presented in Current Liabilities: Other	11
Duke Energy Progress \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	97	18
Offset	(8)	(18)
Cash collateral posted	(1)
Duke Energy Progress \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	40	30
Offset	(28)	(30)
Cash collateral posted	(1)
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	4	16
Duke Energy Indiana \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	4	16
Cash collateral posted	(4)
Duke Energy Indiana \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Cash collateral posted		(16)
Piedmont
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	145	168
Net amounts presented in Current Liabilities: Other	18	27
Net amounts presented in Current Liabilities: Other	127	141
Piedmont \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	18	27
Piedmont \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 127	$ 141

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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