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Severance (Expenses) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) employee | Dec. 31, 2020 USD ($) employee | Dec. 31, 2019 USD ($) employee
Restructuring Cost and Reserve [Line Items] |  |  |
Number of eligible employees | employee | 290 | 30 | 140
Severance expense | $ 69 | $ (85) | $ 16
Amortization of deferred severance charges | 33 |  |
Severance charges adjustments | (3) | (6) |
Unamortized deferred severance |  | (86) |
Duke Energy Carolinas |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance expense | 33 | (58) | 8
Amortization of deferred severance charges | 22 |  |
Severance charges adjustments | (2) | (2) |
Unamortized deferred severance |  | (57) |
Progress Energy |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance expense | 26 | (28) | 6
Amortization of deferred severance charges | 11 |  |
Severance charges adjustments |  | (3) |
Unamortized deferred severance |  | (29) |
Duke Energy Progress |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance expense | 20 | (31) | 3
Amortization of deferred severance charges | 11 |  |
Severance charges adjustments |  | (2) |
Unamortized deferred severance |  | (29) |
Duke Energy Florida |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance expense | 6 | $ 3 | 3
Duke Energy Ohio |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance expense | 2 |  |
Duke Energy Indiana |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance expense | 3 |  | 1
Severance charges adjustments | (1) |  |
Piedmont |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance expense | $ 2 |  | $ 1

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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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