Commitments and Contingencies (Purchased Power) (Details) - Purchased Power Contracts $ in Millions	12 Months Ended
Dec. 31, 2023 USD ($)
Duke Energy Progress
Unconditional Purchase Obligations [Abstract]
2024	$ 21
2025	22
2026	18
2027	19
2028	19
Thereafter	7
Total	$ 106
Duke Energy Progress \| Minimum
Unconditional Purchase Obligations [Abstract]
Net plant output (as a percent)	18.00%
Duke Energy Progress \| Maximum
Unconditional Purchase Obligations [Abstract]
Net plant output (as a percent)	100.00%
Duke Energy Florida
Unconditional Purchase Obligations [Abstract]
2024	$ 86
2025	91
Total	$ 177
Net plant output (as a percent)	100.00%
Duke Energy Ohio
Unconditional Purchase Obligations [Abstract]
2024	$ 153
2025	98
Total	251
Duke Energy Indiana
Unconditional Purchase Obligations [Abstract]
2024	12
2025	20
2026	8
Total	$ 40

Share of plant output being purchased under a long-term contract to purchase electricity from a production plant constructed and financed by a public utility district, cooperative, or other organization.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

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