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Variable Interest Entities (Fair Value Assumptions)(Details)
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3 Months Ended | |
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Mar. 31, 2013
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Mar. 31, 2012
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Duke Energy Ohio [Member]
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| Variable Interest Entity [Line Items] | ||
| Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Expected Credit Losses | 0.60% | 0.70% |
| Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate | 1.20% | 1.20% |
| CRC Receivable Turnover Rate | 12.80% | 12.70% |
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Duke Energy Indiana [Member]
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| Variable Interest Entity [Line Items] | ||
| Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Expected Credit Losses | 0.30% | 0.30% |
| Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate | 1.20% | 1.20% |
| CRC Receivable Turnover Rate | 10.30% | 10.20% |