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Asset Retirement Obligations (Rollforward) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Asset Retirement Obligation [Line Items]
Beginning Balance	$ 9,988	$ 9,152
Accretion expense	474	434
Liabilities settled	(584)	(634)
Liabilities incurred in the current year	18	20
Revisions in estimates of cash flows	(271)	1,016
Ending Balance	9,625	9,988
Duke Energy Carolinas
Asset Retirement Obligation [Line Items]
Beginning Balance	3,990	4,013
Accretion expense	188	183
Liabilities settled	(227)	(212)
Liabilities incurred in the current year	1	8
Revisions in estimates of cash flows	(110)	(2)
Ending Balance	3,842	3,990
Progress Energy
Asset Retirement Obligation [Line Items]
Beginning Balance	4,548	4,145
Accretion expense	219	199
Liabilities settled	(245)	(321)
Liabilities incurred in the current year	17	12
Revisions in estimates of cash flows	(53)	513
Ending Balance	4,486	4,548
Duke Energy Progress
Asset Retirement Obligation [Line Items]
Beginning Balance	4,334	3,870
Accretion expense	211	190
Liabilities settled	(203)	(232)
Liabilities incurred in the current year	5
Revisions in estimates of cash flows	(58)	506
Ending Balance	4,289	4,334
Duke Energy Florida
Asset Retirement Obligation [Line Items]
Beginning Balance	214	275
Accretion expense	8	9
Liabilities settled	(42)	(89)
Liabilities incurred in the current year	12	12
Revisions in estimates of cash flows	5	7
Ending Balance	197	214
Duke Energy Ohio
Asset Retirement Obligation [Line Items]
Beginning Balance	139	136
Accretion expense	7	7
Liabilities settled	(6)	(7)
Revisions in estimates of cash flows	(5)	3
Ending Balance	135	139
Duke Energy Indiana
Asset Retirement Obligation [Line Items]
Beginning Balance	1,268	809
Accretion expense	65	49
Liabilities settled	(106)	(94)
Revisions in estimates of cash flows	(102)	504
Ending Balance	1,125	1,268
Piedmont
Asset Retirement Obligation [Line Items]
Beginning Balance	24	21
Accretion expense	1	2
Revisions in estimates of cash flows		1
Ending Balance	$ 25	$ 24

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- Definition

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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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- Definition

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 incurred during the period.

+ References

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

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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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