Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 561	$ 729
Net amounts presented in Current Liabilities: Other	167	311
Net amounts presented in Other Noncurrent Liabilities: Other	300	217
Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	205	409
Offset	(15)	(2)
Cash collateral posted	$ (23)	$ (96)
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current Liabilities: Other	Current Liabilities: Other
Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 356	$ 320
Offset	(26)	(37)
Cash collateral posted	$ (30)	$ (66)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other	Other
Duke Energy Carolinas
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 186	$ 260
Net amounts presented in Current Liabilities: Other	72	130
Net amounts presented in Other Noncurrent Liabilities: Other	61	29
Duke Energy Carolinas \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	93	179
Offset	(8)	(1)
Cash collateral posted	(13)	(48)
Duke Energy Carolinas \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	93	81
Offset	(10)	(14)
Cash collateral posted	(22)	(38)
Progress Energy
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	165	234
Net amounts presented in Current Liabilities: Other	49	118
Net amounts presented in Other Noncurrent Liabilities: Other	79	35
Progress Energy \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	61	149
Offset	(7)	(1)
Cash collateral posted	(5)	(30)
Progress Energy \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	104	85
Offset	(16)	(22)
Cash collateral posted	(9)	(28)
Duke Energy Progress
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	140	219
Net amounts presented in Current Liabilities: Other	49	118
Net amounts presented in Other Noncurrent Liabilities: Other	54	20
Duke Energy Progress \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	61	149
Offset	(7)	(1)
Cash collateral posted	(5)	(30)
Duke Energy Progress \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	79	70
Offset	(16)	(22)
Cash collateral posted	(9)	(28)
Duke Energy Florida
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	26	15
Net amounts presented in Current Liabilities: Other	0	0
Net amounts presented in Other Noncurrent Liabilities: Other	26	15
Duke Energy Florida \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	0	0
Offset	0	0
Cash collateral posted	0	0
Duke Energy Florida \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	26	15
Offset	0	0
Cash collateral posted	0	0
Duke Energy Ohio
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	1	1
Net amounts presented in Current Liabilities: Other	0	0
Net amounts presented in Other Noncurrent Liabilities: Other	1	1
Duke Energy Ohio \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	0	0
Offset	0	0
Cash collateral posted	0	0
Duke Energy Ohio \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	1	1
Offset	0	0
Cash collateral posted	0	0
Duke Energy Indiana
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	4	18
Net amounts presented in Current Liabilities: Other	0	0
Net amounts presented in Other Noncurrent Liabilities: Other	0	0
Duke Energy Indiana \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	4	18
Offset	0	0
Cash collateral posted	(4)	(18)
Duke Energy Indiana \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	0	0
Offset	0	0
Cash collateral posted	0	0
Piedmont
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	124	147
Net amounts presented in Current Liabilities: Other	17	20
Net amounts presented in Other Noncurrent Liabilities: Other	107	127
Piedmont \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	17	20
Offset	0	0
Cash collateral posted	0	0
Piedmont \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	107	127
Offset	0	0
Cash collateral posted	$ 0	$ 0

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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