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Leases (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Lessee, Lease, Description [Line Items] |  |  |
Operating lease assets, cost basis | $ 155,580 | $ 147,654 |
Piedmont |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease assets, cost basis | 9,134 | 8,446 |
Construction and transportation of natural gas pipelines | Piedmont |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Net investment in lease, current | 2 | 4 |
Renewable energy projects |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Contingent lease payments | 275 | 264 | $ 268
Operating lease assets, cost basis | 3,335 | 3,349 |
Operating lease assets, accumulated depreciation | 848 | 721 |
Duke Energy Carolinas | Construction and transportation of natural gas pipelines | Piedmont |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Net investment in lease, noncurrent | $ 205 | $ 70 |

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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