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Partners' Capital and Distributions - Subsidiary Distributions (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended
	May 17, 2021	May 14, 2021	Feb. 12, 2021	Mar. 31, 2021	Mar. 31, 2020
Partners' Capital and Distributions
Total distributions paid				$ 185.0	$ 311.0
PAA | Series A Preferred Units | Cash Distribution
Partners' Capital and Distributions
Preferred unit distribution amount			$ 37.0
Preferred unit distribution amount (in dollars per unit)			$ 0.525
PAA | Series A Preferred Units | Cash Distribution | Forecast
Partners' Capital and Distributions
Preferred unit distribution amount		$ 37.0
Preferred unit distribution amount (in dollars per unit)		$ 0.525
PAA | Series B Preferred Units | Cash Distribution | Forecast
Partners' Capital and Distributions
Preferred unit distribution amount	$ 24.5
Preferred unit distribution amount (in dollars per unit)	$ 30.625
PAA | Common Units | Cash Distribution
Partners' Capital and Distributions
Total distributions paid			$ 130.0
Distributions per common unit, paid (usd per unit)			$ 0.18
PAA | Common Units | Cash Distribution | Forecast
Partners' Capital and Distributions
Total distributions paid		$ 130.0
Distributions per common unit, paid (usd per unit)		$ 0.18
AAP | Cash Distribution
Partners' Capital and Distributions
Distributions to noncontrolling interests			$ 9.0
Distributions to PAGP			35.0
Total distributions paid			44.0
AAP | Cash Distribution | Forecast
Partners' Capital and Distributions
Distributions to noncontrolling interests		$ 9.0
Distributions to PAGP		35.0
Total distributions paid		44.0
Public | PAA | Common Units | Cash Distribution
Partners' Capital and Distributions
Distributions to common unitholders			86.0
Public | PAA | Common Units | Cash Distribution | Forecast
Partners' Capital and Distributions
Distributions to common unitholders		86.0
AAP | PAA | Common Units | Cash Distribution
Partners' Capital and Distributions
Distributions to common unitholders			$ 44.0
AAP | PAA | Common Units | Cash Distribution | Forecast
Partners' Capital and Distributions
Distributions to common unitholders		$ 44.0
Other current liabilities | PAA | Series B Preferred Units
Partners' Capital and Distributions
Amount accrued to distributions payable				18.0
Noncontrolling Interests
Partners' Capital and Distributions
Total distributions paid				150.0	$ 245.0
Noncontrolling Interests | Red River LLC
Partners' Capital and Distributions
Total distributions paid				$ 6.0

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