Partners' Capital and Distributions - Exchange Rights and Shares Activity (Details)	9 Months Ended
	Sep. 30, 2016 shares	Sep. 30, 2015 shares
Class B Shares
Activity for Class A shares and Class B shares
Balance, beginning of period (shares)	376,771,593	399,096,499
Balance, end of period (shares)	373,849,892	378,845,615
Class B Shares | Exchange of AAP Units and Class B Shares for Class A Shares
Activity for Class A shares and Class B shares
Shares (exchanged)/issued in connection with Exchange Right exercises (shares)	(39,052,628)	(20,250,884)
Class B Shares | Conversion of AAP Management Units into AAP Units and Class B Shares
Activity for Class A shares and Class B shares
Shares issued in connection with conversion of AAP Management Units (shares)	36,130,927
Class A Shares
Activity for Class A shares and Class B shares
Balance, beginning of period (shares)	229,278,980	206,933,274
Shares issued in connection with PAGP LTIP award vestings (shares)	20,800	20,800
Balance, end of period (shares)	268,352,408	227,204,958
Class A Shares | Exchange of AAP Units and Class B Shares for Class A Shares
Activity for Class A shares and Class B shares
Shares (exchanged)/issued in connection with Exchange Right exercises (shares)	39,052,628	20,250,884
AAP | Exchange of AAP Units and Class B Shares for Class A Shares
Partners Capital and Distributions
Ratio for conversion or exchange of units	1
AAP | Conversion of AAP Management Units into AAP Units and Class B Shares | AAP Management Units
Partners Capital and Distributions
Ratio for conversion or exchange of units	0.941
AAP Management Units converted (units)	38,446,238