Derivatives and Hedging (Offsetting Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 248	$ 319
Derivative liabilities, current	$ 90	$ 113
Derivative liabilities, current, location	Current Liabilities: Other	Current Liabilities: Other
Derivative liabilities, noncurrent	$ 105	$ 133
Derivative liabilities, noncurrent, location	Other	Other
Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 117	$ 145
Offset	(24)	(29)
Cash collateral posted	(3)	(3)
Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	131	174
Offset	(26)	(37)
Cash collateral posted		(4)
Duke Energy Carolinas
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	79	88
Derivative liabilities, current	31	40
Derivative liabilities, noncurrent	22	8
Duke Energy Carolinas \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	43	57
Offset	(12)	(15)
Cash collateral posted	0	(2)
Duke Energy Carolinas \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	36	31
Offset	(14)	(19)
Cash collateral posted		(4)
Progress Energy
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	54	58
Derivative liabilities, current	16	20
Derivative liabilities, noncurrent	13	7
Progress Energy \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	29	34
Offset	(13)	(14)
Cash collateral posted	0	0
Progress Energy \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	25	24
Offset	(12)	(17)
Cash collateral posted		0
Duke Energy Progress
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	36	57
Derivative liabilities, current	4	19
Derivative liabilities, noncurrent	7	7
Duke Energy Progress \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	17	33
Offset	(13)	(14)
Cash collateral posted	0	0
Duke Energy Progress \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	19	24
Offset	(12)	(17)
Cash collateral posted		0
Duke Energy Florida
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	18	1
Derivative liabilities, current	12	1
Derivative liabilities, noncurrent	6	0
Duke Energy Florida \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	12	1
Offset	0	0
Cash collateral posted	0	0
Duke Energy Florida \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	6	0
Offset	0	0
Cash collateral posted		0
Duke Energy Ohio
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	0	1
Derivative liabilities, current	0	0
Derivative liabilities, noncurrent	0	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	0	1
Offset	0	0
Cash collateral posted		0
Duke Energy Indiana
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	7	3
Derivative liabilities, current	(1)	2
Derivative liabilities, noncurrent	5	0
Duke Energy Indiana \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	2	3
Offset	0	0
Cash collateral posted	(3)	(1)
Duke Energy Indiana \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	5	0
Offset	0	0
Cash collateral posted		0
Piedmont
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	78	94
Derivative liabilities, current	17	16
Derivative liabilities, noncurrent	61	78
Piedmont \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	17	16
Offset	0	0
Cash collateral posted	0	0
Piedmont \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	61	78
Offset	$ 0	0
Cash collateral posted		$ 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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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

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