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Asset Retirement Obligations (Rollforward) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Asset Retirement Obligation [Line Items]
Beginning Balance	$ 9,988
Accretion expense	357
Liabilities settled	(435)
Revisions in estimates of cash flows	(266)
Ending Balance	9,644
Duke Energy Carolinas
Asset Retirement Obligation [Line Items]
Beginning Balance	3,990
Accretion expense	141
Liabilities settled	(171)
Revisions in estimates of cash flows	(106)
Ending Balance	3,854
Progress Energy
Asset Retirement Obligation [Line Items]
Beginning Balance	4,548
Accretion expense	164
Liabilities settled	(180)
Revisions in estimates of cash flows	(50)
Ending Balance	4,482
Duke Energy Progress
Asset Retirement Obligation [Line Items]
Beginning Balance	4,334
Accretion expense	158
Liabilities settled	(149)
Revisions in estimates of cash flows	(56)
Ending Balance	4,287
Duke Energy Florida
Asset Retirement Obligation [Line Items]
Beginning Balance	214
Accretion expense	6
Liabilities settled	(31)
Revisions in estimates of cash flows	6
Ending Balance	195
Duke Energy Ohio
Asset Retirement Obligation [Line Items]
Beginning Balance	139
Accretion expense	5
Liabilities settled	(5)
Revisions in estimates of cash flows	(6)
Ending Balance	133
Duke Energy Indiana
Asset Retirement Obligation [Line Items]
Beginning Balance	1,268
Accretion expense	49
Liabilities settled	(79)
Revisions in estimates of cash flows	(102)
Ending Balance	1,136
Piedmont
Asset Retirement Obligation [Line Items]
Beginning Balance	24
Accretion expense	2
Liabilities settled	0
Revisions in estimates of cash flows	0
Ending Balance	$ 26

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+ References

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481999/410-20-25-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481879/410-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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