Leases (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Operating lease assets, cost basis	$ 163,839	$ 154,496
Piedmont
Lessee, Lease, Description [Line Items]
Operating lease assets, cost basis	10,869	9,918
Construction and transportation of natural gas pipelines \| Piedmont
Lessee, Lease, Description [Line Items]
Net investment in lease, current	2	2
Duke Energy Carolinas \| Construction and transportation of natural gas pipelines \| Piedmont
Lessee, Lease, Description [Line Items]
Net investment in lease, noncurrent	$ 201	$ 203

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

+ References

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

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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