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Severance (Expenses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |
Severance expense | $ (85) | $ 16 | $ 187
Unamortized deferred severance | (86) |  |
Severance charges adjustments | (6) |  |
Duke Energy Carolinas |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance expense | (58) | 8 | 102
Unamortized deferred severance | (57) |  |
Severance charges adjustments | (2) |  |
Progress Energy |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance expense | (28) | 6 | 69
Unamortized deferred severance | (29) |  |
Severance charges adjustments | (3) |  |
Duke Energy Progress |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance expense | (31) | 3 | 52
Unamortized deferred severance | (29) |  |
Severance charges adjustments | (2) |  |
Duke Energy Florida |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance expense | $ 3 | 3 | 17
Duke Energy Ohio |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance expense |  |  | 6
Duke Energy Indiana |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance expense |  | 1 | 7
Piedmont |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance expense |  | $ 1 | $ 2

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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 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: 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=121586364&loc=d3e3602-108585 + Details
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