v2.4.0.6

Assets and Liabilities with Recurring Fair Value Measurements Quantitative Information about Level 3 Fair Value Measurements (Details) | Dec. 31, 2012 MW
--- | ---
Physical Power [Member] |
Quantitative Information about Level 3 fair Value Measurements [Line Items] |
Fair Value Inputs Quantitative Information Power | 11,000,000
Minimum [Member] |
Quantitative Information about Level 3 fair Value Measurements [Line Items] |
Fair Value Inputs Quantitative Information Power | 23.75
Maximum [Member] |
Quantitative Information about Level 3 fair Value Measurements [Line Items] |
Fair Value Inputs Quantitative Information Power | 53.82

X
- Definition Fair Value Inputs Quantitative Information Power + References No definition available. + Details
Name: | cpn_FairValueInputsQuantitativeInformationPower
Namespace Prefix: | cpn_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | cpn_QuantitativeInformationAboutLevel3FairValueMeasurementsLineItems
Namespace Prefix: | cpn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration