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Debt (First Lien Term Loans) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term Debt $ 11,619us-gaap_LongTermDebt $ 11,122us-gaap_LongTermDebt
First Lien Term Loans 2018 [Member]    
Debt Instrument [Line Items]    
Long-term Debt 1,593us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cpn_FirstLienTermLoans2018Member		 1,597us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cpn_FirstLienTermLoans2018Member
First Lien Term Loan 2019 [Member]    
Debt Instrument [Line Items]    
Long-term Debt 814us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cpn_FirstLienTermLoan2019Member		 816us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cpn_FirstLienTermLoan2019Member
2020 First Lien Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term Debt 385us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cpn_A2020FirstLienTermLoanMember		 386us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cpn_A2020FirstLienTermLoanMember
First Lien Term Loans [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 2,792us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember		 $ 2,799us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember