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Organization and Basis of Presentation (Schedule of Excise Taxes) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Organization And Basis Of Presentation [Line Items] |  |  |  |
Excise taxes collected | $ 95 | $ 91 | $ 194 | $ 182
Duke Energy Carolinas [Member] |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Excise taxes collected | 9 | 9 | 17 | 18
Progress Energy [Member] |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Excise taxes collected | 56 | 55 | 110 | 101
Duke Energy Progress [Member] |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Excise taxes collected | 5 | 4 | 10 | 9
Duke Energy Florida [Member] |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Excise taxes collected | 51 | 51 | 100 | 92
Duke Energy Ohio [Member] |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Excise taxes collected | 25 | 23 | 55 | 51
Duke Energy Indiana [Member] |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Excise taxes collected | $ 5 | 3 | 11 | 10
Piedmont Natural Gas [Member] |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Excise taxes collected |  | $ 1 | $ 1 | $ 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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