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Variable Interest Entities (Fair Value Assumptions)(Details) (Cinergy Receivables [Member])
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9 Months Ended | |
|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Duke Energy Ohio [Member]
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| Variable Interest Entities [Line Items] | ||
| Anticipated credit loss ratio | 0.60% | 0.60% |
| Discount rate | 1.20% | 1.20% |
| Receivable turnover rate | 12.80% | 12.80% |
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Duke Energy Indiana [Member]
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| Variable Interest Entities [Line Items] | ||
| Anticipated credit loss ratio | 0.30% | 0.30% |
| Discount rate | 1.20% | 1.20% |
| Receivable turnover rate | 10.50% | 10.30% |