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Summary of Significant Accounting Policies (Excise Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2016
Organization And Basis Of Presentation [Line Items] |  |  |  |
Excise taxes | $ 405 | $ 376 | $ 362 |
Duke Energy Carolinas [Member] |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Excise taxes | 35 | 36 | 31 |
Progress Energy [Member] |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Excise taxes | 241 | 220 | 213 |
Duke Energy Progress [Member] |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Excise taxes | 19 | 19 | 18 |
Duke Energy Florida [Member] |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Excise taxes | 222 | 201 | 195 |
Duke Energy Ohio [Member] |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Excise taxes | 105 | 98 | 100 |
Duke Energy Indiana [Member] |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Excise taxes | 22 | 20 | $ 17 |
Piedmont Natural Gas [Member] |  |  |  |
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=115205541&loc=SL114868664-224227 + Details
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