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Investments in Unconsolidated Entities (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Combined summarized financial information for unconsolidated entities      
Current assets $ 184us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets $ 177us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets  
Noncurrent assets 2,303us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets 1,067us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets  
Current liabilities 142us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities 57us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities  
Noncurrent liabilities 222us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities 211us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities  
Revenues 531us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue 344us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue 257us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Operating income 301paa_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncome 181paa_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncome 132paa_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncome
Net income $ 285us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ 172us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ 118us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss