Derivatives and Hedging (Offsetting Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 327	$ 382
Derivative assets, current	$ 95	$ 100
Derivative assets, current, location	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current
Derivative assets, noncurrent	$ 204	$ 244
Derivative assets, noncurrent, location	Other	Other
Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 106	$ 116
Offset	(11)	(16)
Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	221	266
Offset	(17)	(22)
Duke Energy Carolinas
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	99	101
Derivative assets, current	34	34
Derivative assets, noncurrent	52	47
Duke Energy Carolinas \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	38	43
Offset	(4)	(9)
Duke Energy Carolinas \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	61	58
Offset	(9)	(11)
Progress Energy
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	66	67
Derivative assets, current	27	29
Derivative assets, noncurrent	24	20
Progress Energy \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	34	36
Offset	(7)	(7)
Progress Energy \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	32	31
Offset	(8)	(11)
Duke Energy Progress
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	45	52
Derivative assets, current	26	29
Derivative assets, noncurrent	4	5
Duke Energy Progress \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	33	36
Offset	(7)	(7)
Duke Energy Progress \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	12	16
Offset	(8)	(11)
Duke Energy Florida
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	21	15
Derivative assets, current	1	1
Derivative assets, noncurrent	20	14
Duke Energy Florida \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	1	1
Offset	0	0
Duke Energy Florida \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	20	14
Offset	0	0
Duke Energy Ohio
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	0
Derivative assets, current	0	0
Derivative assets, noncurrent	0	0
Duke Energy Ohio \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	0
Offset	0	0
Duke Energy Ohio \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	0
Offset	0	0
Duke Energy Indiana
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	9	12
Derivative assets, current	7	11
Derivative assets, noncurrent	2	1
Duke Energy Indiana \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	7	11
Offset	0	0
Duke Energy Indiana \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	2	1
Offset	0	0
Piedmont
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	0
Derivative assets, current	0	0
Derivative assets, noncurrent	0	0
Piedmont \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	0
Offset	0	0
Piedmont \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	0
Offset	$ 0	$ 0

Indicates line item in statement of financial position that includes derivative asset classified as current.

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-Name Accounting Standards Codification
-Section 55
-Paragraph 10
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- Definition

Fair value of liability associated with financial asset or other 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.

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- Definition

Indicates line item in statement of financial position that includes derivative asset classified as noncurrent.

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Fair value, after the effects of master netting arrangements, of a financial asset or other 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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Fair value, after the effects of master netting arrangements, of a financial asset or other 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, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, before effects of master netting arrangements, of a financial asset or other 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 assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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