Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
FV-NI:
Realized gains	$ 68	$ 26
Realized losses	18	46
AFS:
Realized gains	10	8
Realized losses	14	32
Duke Energy Carolinas
FV-NI:
Realized gains	53	18
Realized losses	6	29
AFS:
Realized gains	4	5
Realized losses	6	20
Progress Energy
FV-NI:
Realized gains	15	8
Realized losses	12	17
AFS:
Realized gains	6	3
Realized losses	8	12
Duke Energy Progress
FV-NI:
Realized gains	15	8
Realized losses	12	17
AFS:
Realized gains	6	3
Realized losses	$ 8	$ 12

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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
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-9

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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).

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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).

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