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Severance (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Restructuring Cost and Reserve [Line Items] |  |
Regulatory assets | $ 14,637 | $ 14,062
Duke Energy Carolinas |  |
Restructuring Cost and Reserve [Line Items] |  |
Regulatory assets | 3,479 | 3,469
Duke Energy Carolinas | Employee Severance |  |
Restructuring Cost and Reserve [Line Items] |  |
Regulatory assets |  | 65
Duke Energy Progress |  |
Restructuring Cost and Reserve [Line Items] |  |
Regulatory assets | $ 4,651 | 4,468
Duke Energy Progress | Employee Severance |  |
Restructuring Cost and Reserve [Line Items] |  |
Regulatory assets |  | $ 33

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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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