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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
FV-NI:
Realized gains	$ 61	$ 61	$ 256	$ 107
Realized losses	19	35	64	117
AFS:
Realized gains	10	16	22	37
Realized losses	8	45	44	104
Duke Energy Carolinas
FV-NI:
Realized gains	38	43	163	70
Realized losses	9	17	30	64
AFS:
Realized gains	6	12	11	21
Realized losses	5	26	22	54
Progress Energy
FV-NI:
Realized gains	23	18	93	37
Realized losses	10	18	34	53
AFS:
Realized gains	4	4	11	16
Realized losses	3	19	22	50
Duke Energy Progress
FV-NI:
Realized gains	23	15	93	34
Realized losses	10	18	34	52
AFS:
Realized gains	4	4	11	15
Realized losses	$ 3	$ 18	$ 21	$ 47

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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
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 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
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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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