Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
FV-NI:
Realized gains	$ 26	$ 111
Realized losses	46	85
AFS:
Realized gains	8	4
Realized losses	32	23
Duke Energy Carolinas
FV-NI:
Realized gains	18	75
Realized losses	29	49
AFS:
Realized gains	5	3
Realized losses	20	16
Progress Energy
FV-NI:
Realized gains	8	36
Realized losses	17	36
AFS:
Realized gains	3	1
Realized losses	12	6
Duke Energy Progress
FV-NI:
Realized gains	8	36
Realized losses	17	35
AFS:
Realized gains	3	1
Realized losses	$ 12	$ 5

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117546-209714

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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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