Commitments and Contingencies (Purchased Power) (Details) - Purchased Power Contracts $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)
Duke Energy Progress
Unconditional Purchase Obligations [Abstract]
2022	$ 22
2023	22
2024	21
2025	22
2026	18
Thereafter	45
Total	$ 150
Duke Energy Progress \| Minimum
Unconditional Purchase Obligations [Abstract]
Net plant output percent	18.00%
Duke Energy Progress \| Maximum
Unconditional Purchase Obligations [Abstract]
Net plant output percent	100.00%
Duke Energy Florida
Unconditional Purchase Obligations [Abstract]
2022	$ 354
2023	374
2024	262
2025	91
Total	$ 1,081
Net plant output percent	100.00%
Duke Energy Ohio
Unconditional Purchase Obligations [Abstract]
2022	$ 53
2023	34
Total	$ 87
Net plant output percent	15.00%

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 10
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-Paragraph 1
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in next 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).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fourth 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).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in third 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).

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Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
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-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=123406679&loc=d3e25336-109308

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