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Related Party (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Related Party Transaction    
Proceeds from Equity Method Investment, Dividends or Distributions $ 4us-gaap_EquityMethodInvestmentDividendsOrDistributions $ 1us-gaap_EquityMethodInvestmentDividendsOrDistributions
ETP    
Related Party Transaction    
Proceeds from Equity Method Investment, Dividends or Distributions 2us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_RelatedPartyTransactionAxis
= pepl_EtpMember		 2us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_RelatedPartyTransactionAxis
= pepl_EtpMember
Regency [Member]    
Related Party Transaction    
Proceeds from Equity Method Investment, Dividends or Distributions $ 16us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_RelatedPartyTransactionAxis
= pepl_RegencyMember		 $ 15us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_RelatedPartyTransactionAxis
= pepl_RegencyMember