Leases (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease assets, cost basis	$ 161,819	$ 155,580
Piedmont
Lessee, Lease, Description [Line Items]
Operating lease assets, cost basis	9,918	9,134
Construction and transportation of natural gas pipelines \| Piedmont
Lessee, Lease, Description [Line Items]
Net investment in lease, current	2	2
Renewable energy projects
Lessee, Lease, Description [Line Items]
Contingent lease payments	259	275	$ 264
Operating lease assets, cost basis	3,339	3,335
Operating lease assets, accumulated depreciation	966	848
Duke Energy Carolinas \| Construction and transportation of natural gas pipelines \| Piedmont
Lessee, Lease, Description [Line Items]
Net investment in lease, noncurrent	$ 203	$ 205

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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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