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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
CONDENSED CONSOLIDATED BALANCE SHEETS    
Senior notes, unamortized discount $ 17us-gaap_DebtInstrumentUnamortizedDiscount $ 18us-gaap_DebtInstrumentUnamortizedDiscount
Class A Shares    
Shares outstanding    
Shares outstanding 222,773,809us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ us-gaap_LimitedPartnersCapitalAccountByClassAxis
= pagp_SharesClassMember		 206,933,274us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ us-gaap_LimitedPartnersCapitalAccountByClassAxis
= pagp_SharesClassMember
Class B Shares    
Shares outstanding    
Shares outstanding 383,276,764us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ us-gaap_LimitedPartnersCapitalAccountByClassAxis
= pagp_SharesClassBMember		 399,096,499us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ us-gaap_LimitedPartnersCapitalAccountByClassAxis
= pagp_SharesClassBMember