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Leases (Narrative) (Details) - Construction and transportation of natural gas pipelines - Piedmont - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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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 | $ 197 | $ 199

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