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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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- 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 http://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 http://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 http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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