Leases (Narrative) (Details) - Construction and transportation of natural gas pipelines - Piedmont - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Net investment in lease, current	$ 2	$ 2
Duke Energy Carolinas
Lessee, Lease, Description [Line Items]
Net investment in lease, noncurrent	$ 199	$ 201

Amount, before allowance for credit loss, of net investment in sales-type and direct financing leases, classified as noncurrent.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479016/842-30-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479016/842-30-45-2

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant