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v3.20.4

Severance (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) employee | Dec. 31, 2019 USD ($) employee | Dec. 31, 2018 employee
Restructuring Cost and Reserve [Line Items] |  |  |
Regulatory assets | $ 14,062 | $ 15,018 |
Number of eligible employees | employee | 30 | 140 | 1,900
Duke Energy Progress |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Regulatory assets | $ 4,468 | $ 4,678 |
Duke Energy Progress | Employee Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Regulatory assets | 33 |  |
Duke Energy Carolinas |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Regulatory assets | 3,469 | $ 3,910 |
Duke Energy Carolinas | Employee Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Regulatory assets | $ 65 |  |

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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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