v2.4.0.8

Organization and Basis of Presentation (Schedule of Unbilled Revenues with Restricted Receivables) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Organization And Basis Of Presentation [Line Items] |  |
Unbilled receivables | $ 798 | $ 937
Duke Energy Carolinas [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Unbilled receivables | 285 | 323
Progress Energy [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Unbilled receivables | 232 | 189
Duke Energy Progress [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Unbilled receivables | 131 | 120
Duke Energy Florida [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Unbilled receivables | 101 | 69
Duke Energy Ohio [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Unbilled receivables |  | 55
Duke Energy Ohio [Member] | Cinergy Receivables [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Unbilled receivables | 54 | 89
Duke Energy Indiana [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Unbilled receivables | 26 | 5
Duke Energy Indiana [Member] | Cinergy Receivables [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Unbilled receivables | $ 94 | $ 144

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- Details
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Namespace Prefix: | duk_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
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Balance Type: | debit
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