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Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
FV-NI:
Realized gains	$ 1,174	$ 600	$ 129
Realized losses	145	85	146
AFS:
Realized gains	67	28	44
Realized losses	77	67	140
Duke Energy Carolinas
FV-NI:
Realized gains	693	298	82
Realized losses	77	40	79
AFS:
Realized gains	51	14	22
Realized losses	57	40	65
Progress Energy
FV-NI:
Realized gains	481	302	47
Realized losses	68	45	67
AFS:
Realized gains	16	14	22
Realized losses	20	27	75
Duke Energy Progress
FV-NI:
Realized gains	478	288	44
Realized losses	67	44	66
AFS:
Realized gains	15	13	20
Realized losses	$ 19	$ 26	$ 70

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

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Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-4

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Amount of realized loss from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

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-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 4
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-URI https://asc.fasb.org/1943274/2147479536/321-10-50-4

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