Derivatives and Hedging (Offsetting Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 283	$ 244
Derivative liabilities, current	$ 151	$ 107
Derivative liabilities, current, location	Other Liabilities, Current	Other Liabilities, Current
Derivative liabilities, noncurrent	$ 94	$ 90
Derivative liabilities, noncurrent, location	Other	Other
Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 172	$ 131
Offset	(11)	(16)
Cash collateral posted	(10)	(8)
Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	111	113
Offset	(17)	(22)
Cash collateral posted		(1)
Duke Energy Carolinas
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	102	88
Derivative liabilities, current	67	46
Derivative liabilities, noncurrent	22	20
Duke Energy Carolinas \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	71	56
Offset	(4)	(9)
Cash collateral posted	0	(1)
Duke Energy Carolinas \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	31	32
Offset	(9)	(11)
Cash collateral posted		(1)
Progress Energy
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	73	48
Derivative liabilities, current	39	14
Derivative liabilities, noncurrent	19	16
Progress Energy \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	46	21
Offset	(7)	(7)
Cash collateral posted	0	0
Progress Energy \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	27	27
Offset	(8)	(11)
Cash collateral posted		0
Duke Energy Progress
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	70	47
Derivative liabilities, current	37	13
Derivative liabilities, noncurrent	18	16
Duke Energy Progress \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	44	20
Offset	(7)	(7)
Cash collateral posted	0	0
Duke Energy Progress \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	26	27
Offset	(8)	(11)
Cash collateral posted		0
Duke Energy Florida
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	3	1
Derivative liabilities, current	2	1
Derivative liabilities, noncurrent	1	0
Duke Energy Florida \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	2	1
Offset	0	0
Cash collateral posted	0	0
Duke Energy Florida \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	1	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	10	9
Derivative liabilities, current	0	2
Derivative liabilities, noncurrent	0	0
Duke Energy Indiana \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	10	9
Offset	0	0
Cash collateral posted	(10)	(7)
Duke Energy Indiana \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	0	0
Offset	0	0
Cash collateral posted		0
Piedmont
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	68	72
Derivative liabilities, current	16	19
Derivative liabilities, noncurrent	52	53
Piedmont \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	16	19
Offset	0	0
Cash collateral posted	0	0
Piedmont \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	52	53
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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