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Variable Interest Entities (Schedule of Accounts Receivable Securitizations) (Details) (USD $)
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9 Months Ended |
|---|---|
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Sep. 30, 2014
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| Variable Interest Entities [Line Items] | |
| Debt Instrument, Face Amount | $ 2,222,000,000 |
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Duke Energy Progress [Member]
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|
| Variable Interest Entities [Line Items] | |
| Debt Instrument, Face Amount | 650,000,000 |
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Duke Energy Florida [Member]
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| Variable Interest Entities [Line Items] | |
| Debt Instrument, Face Amount | 225,000,000 |
|
DERF [Member] | Duke Energy Carolinas [Member] | Variable Interest Entity, Primary Beneficiary [Member]
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|
| Variable Interest Entities [Line Items] | |
| Debt Instrument, Face Amount | 400,000,000 |
| Line of Credit Facility, Expiration Date | Oct. 01, 2016 |
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DEPR [Member] | Duke Energy Progress [Member] | Variable Interest Entity, Primary Beneficiary [Member]
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|
| Variable Interest Entities [Line Items] | |
| Debt Instrument, Face Amount | 300,000,000 |
| Line of Credit Facility, Expiration Date | Dec. 01, 2016 |
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DEFR [Member] | Duke Energy Florida [Member] | Variable Interest Entity, Primary Beneficiary [Member]
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| Variable Interest Entities [Line Items] | |
| Debt Instrument, Face Amount | $ 225,000,000 |
| Line of Credit Facility, Expiration Date | Mar. 01, 2017 |