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Summary of Significant Accounting Policies (Excise Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Organization And Basis Of Presentation [Line Items] |  |  |
Excise taxes | $ 458 | $ 449 | $ 420
Duke Energy Carolinas |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Excise taxes | 27 | 47 | 44
Progress Energy |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Excise taxes | 322 | 290 | 250
Duke Energy Progress |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Excise taxes | 5 | 25 | 22
Duke Energy Florida |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Excise taxes | 317 | 265 | 228
Duke Energy Ohio |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Excise taxes | 106 | 104 | 102
Duke Energy Indiana |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Excise taxes | 1 | 7 | 23
Piedmont |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Excise taxes | $ 2 | $ 1 | $ 1

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- Definition The excise taxes collected by a public utility and reported in revenues if the amount of excise taxes is equal to 1 percent or more of such total. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)(e)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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