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Summary of Significant Accounting Policies (Excise Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Organization And Basis Of Presentation [Line Items] |  |  |
Excise taxes | $ 421 | $ 405 | $ 376
Duke Energy Carolinas |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Excise taxes | 39 | 35 | 36
Progress Energy |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Excise taxes | 256 | 241 | 220
Duke Energy Progress |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Excise taxes | 21 | 19 | 19
Duke Energy Florida |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Excise taxes | 235 | 222 | 201
Duke Energy Ohio |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Excise taxes | 101 | 105 | 98
Duke Energy Indiana |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Excise taxes | 23 | 22 | 20
Piedmont |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Excise taxes | $ 2 | $ 2 | $ 2

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)(e)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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