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Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
FV-NI:
Realized gains	$ 848	$ 61	$ 1,015	$ 256
Realized losses	21	19	102	64
AFS:
Realized gains	23	10	43	22
Realized losses	20	8	57	44
Duke Energy Carolinas
FV-NI:
Realized gains	490	38	594	163
Realized losses	12	9	53	30
AFS:
Realized gains	17	6	32	11
Realized losses	17	5	40	22
Progress Energy
FV-NI:
Realized gains	358	23	421	93
Realized losses	9	10	49	34
AFS:
Realized gains	6	4	11	11
Realized losses	3	3	17	22
Duke Energy Progress
FV-NI:
Realized gains	358	23	419	93
Realized losses	9	10	49	34
AFS:
Realized gains	5	4	10	11
Realized losses	$ 3	$ 3	$ 16	$ 21

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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).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
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-Publisher FASB
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
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-Publisher FASB
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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
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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).

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-SubTopic 10
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