Partners' Capital and Distributions (Details 2)	9 Months Ended
	Sep. 30, 2015 shares
Class B Shares
Partners Capital and Distributions
Balance, beginning of period (in shares)	399,096,499
Shares exchanged in connection with Exchange Right exercises	(20,250,884)
Balance, end of period (in shares)	378,845,615
Class A Shares
Partners Capital and Distributions
Balance, beginning of period (in shares)	206,933,274
Shares issued in connection with Exchange Right exercises	20,250,884
Shares issued in connection with PAGP LTIP award vestings	20,800
Balance, end of period (in shares)	227,204,958
Class A Shares | AAP units
Partners Capital and Distributions
AAP unit exchange ratio to Class A shares	1