Commitments and Contingencies (Purchased Power) (Details) - Purchased Power Contracts $ in Millions	12 Months Ended
Dec. 31, 2024 USD ($)
Duke Energy Progress
Unconditional Purchase Obligations [Abstract]
2025	$ 22
2026	18
2027	19
2028	18
2029	3
Thereafter	31
Total	$ 111
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 Indiana
Unconditional Purchase Obligations [Abstract]
2025	$ 33
2026	12
Total	$ 45

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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 440
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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