Derivatives and Hedging (Offsetting Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 360	$ 434
Derivative assets, current	$ 37	$ 238
Derivative assets, current, location	Current Assets: Other	Current Assets: Other
Derivative assets, noncurrent	$ 272	$ 130
Derivative assets, noncurrent, location	Other	Other
Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 62	$ 267
Offset	(25)	(29)
Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	298	167
Offset	(26)	(37)
Duke Energy Carolinas
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	77	94
Derivative assets, current	10	24
Derivative assets, noncurrent	41	36
Duke Energy Carolinas \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	22	39
Offset	(12)	(15)
Duke Energy Carolinas \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	55	55
Offset	(14)	(19)
Progress Energy
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	72	127
Derivative assets, current	11	58
Derivative assets, noncurrent	36	38
Progress Energy \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	24	72
Offset	(13)	(14)
Progress Energy \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	48	55
Offset	(12)	(17)
Duke Energy Progress
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	62	109
Derivative assets, current	8	47
Derivative assets, noncurrent	29	31
Duke Energy Progress \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	21	61
Offset	(13)	(14)
Duke Energy Progress \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	41	48
Offset	(12)	(17)
Duke Energy Florida
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	10	18
Derivative assets, current	2	11
Derivative assets, noncurrent	8	7
Duke Energy Florida \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	2	11
Offset	0	0
Duke Energy Florida \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	8	7
Offset	0	0
Duke Energy Ohio
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	1	1
Derivative assets, current	1	1
Derivative assets, noncurrent	0	0
Duke Energy Ohio \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	1	1
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	14	44
Derivative assets, current	14	44
Derivative assets, noncurrent	0	0
Duke Energy Indiana \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	14	44
Offset	0	0
Duke Energy Indiana \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	0
Offset	0	0
Piedmont
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	1	1
Derivative assets, current	1	1
Derivative assets, noncurrent	0	0
Piedmont \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	1	1
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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-SubTopic 20
-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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