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Equity-Indexed Compensation Plans (Detail 3) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Other Consolidated Equity-Indexed Compensation Information    
Equity-indexed compensation expense $ 19us-gaap_AllocatedShareBasedCompensationExpense $ 34us-gaap_AllocatedShareBasedCompensationExpense
LTIP unit or share-settled vestings 1pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalSettlementFairValue 5pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalSettlementFairValue
LTIP cash-settled vestings   1pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedInPeriodCashSettled
DER cash payments 2pagp_DistributionEquivalentRightsCashPayments 2pagp_DistributionEquivalentRightsCashPayments
PAGP LTIP    
Other Consolidated Equity-Indexed Compensation Information    
LTIP cash-settled vestings 0pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedInPeriodCashSettled
/ us-gaap_PlanNameAxis
= pagp_PlainsGPHoldingsLongTermIncentivePlansMember		 0pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedInPeriodCashSettled
/ us-gaap_PlanNameAxis
= pagp_PlainsGPHoldingsLongTermIncentivePlansMember
DER cash payments   0pagp_DistributionEquivalentRightsCashPayments
/ us-gaap_PlanNameAxis
= pagp_PlainsGPHoldingsLongTermIncentivePlansMember
PAGP LTIP | Maximum    
Other Consolidated Equity-Indexed Compensation Information    
Equity-indexed compensation expense 1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= pagp_PlainsGPHoldingsLongTermIncentivePlansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= pagp_PlainsGPHoldingsLongTermIncentivePlansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
DER cash payments 1pagp_DistributionEquivalentRightsCashPayments
/ us-gaap_PlanNameAxis
= pagp_PlainsGPHoldingsLongTermIncentivePlansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
PAA LTIP | Maximum    
Other Consolidated Equity-Indexed Compensation Information    
LTIP cash-settled vestings $ 1pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedInPeriodCashSettled
/ us-gaap_PlanNameAxis
= pagp_PlainsAllAmericanLongTermIncentivePlansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember