v2.4.0.6

Variable Interest Entities (Receivables Sold)(Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Duke Energy Ohio [Member] |  |
Variable Interest Entity [Line Items] |  |
CRC Gross Receivables Sold | $ 304 | $ 282
CRC Retained Interests | 115 | 97
CRC Net Receivables Sold | 189 | 185
Duke Energy Indiana [Member] |  |
Variable Interest Entity [Line Items] |  |
CRC Gross Receivables Sold | 317 | 289
CRC Retained Interests | 135 | 116
CRC Net Receivables Sold | $ 182 | $ 173

X
- Definition Gross customer accounts receivables sold to Cinergy Receivables. + References No definition available. + Details
Name: | duk_CrcGrossReceivablesSold
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Gross receivables to be sold to CRC, less retained interests. + References No definition available. + Details
Name: | duk_CrcNetReceivablesSold
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of receivables retained, not sold to CRC + References No definition available. + Details
Name: | duk_CrcRetainedInterests
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration