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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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- 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 -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=123420820&loc=SL77919306-209978 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=123420820&loc=SL77919308-209978 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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