Partners' Capital and Distributions - Shares and Exchange and Remption Rights (Details) $ in Millions	1 Months Ended	12 Months Ended
	Nov. 30, 2014 shares	Dec. 31, 2016 shares	Dec. 31, 2015 shares	Dec. 31, 2014 shares	Dec. 27, 2016 USD ($)
Partners Capital and Distributions
Equity distribution agreement, authorized sale amount | $					$ 500
Conversion of AAP Management Units into AAP Units
Partners Capital and Distributions
Ratio for conversion or exchange of units		0.941
Class A Shares
Activity for Class A shares and Class B shares
Balance, beginning of period (in shares)		86,099,037	77,707,758	50,257,321
Shares issued in connection with PAGP LTIP award vestings (in shares)		7,811	7,811
Balance, end of period (in shares)		101,206,526	86,099,037	77,707,758
Shares issued/(exchanged) in connection with Exchange Right exercises		15,099,678	8,383,468	27,450,437
Class A Shares | Oxy
Activity for Class A shares and Class B shares
Shares issued/(exchanged) in connection with Exchange Right exercises	25,910,938
Class B Shares
Activity for Class A shares and Class B shares
Balance, beginning of period (in shares)		141,485,588	149,869,056	177,319,493
Shares issued in connection with conversion of AAP Management Units (in shares)		14,693,093
Shares redeemed in connection with Redemption Right exercises (in shares)		(3,035,517)
Balance, end of period (in shares)		138,043,486	141,485,588	149,869,056
Shares issued/(exchanged) in connection with Exchange Right exercises		(15,099,678)	(8,383,468)	(27,450,437)
Class C Shares
Activity for Class A shares and Class B shares
Balance, beginning of period (in shares)		0	0
Shares issued in connection with the Simplification Transactions (in shares)		477,648,826
Shares issued in connection with PAA common unit issuances (in shares)		11,226,520
Shares issued in connection with Redemption Right exercises (in shares)		3,035,517
Balance, end of period (in shares)		491,910,863	0	0
AAP | Exchange Of Aap Units And Class B Shares For Classa Shares [Member]
Partners Capital and Distributions
Ratio for conversion or exchange of units		1
AAP | Conversion of AAP Management Units into AAP Units
Partners Capital and Distributions
Ratio for conversion or exchange of units		0.941