Partners' Capital and Distributions - Noncontrolling Interests in Subsidiaries (Details)	Jun. 30, 2021
AAP
Partners' Capital and Distributions
Noncontrolling interests in subsidiaries (percent)	21.00%
Red River LLC
Partners' Capital and Distributions
Noncontrolling interests in subsidiaries (percent)	33.00%
Common Units and Series A Preferred Units | PAA
Partners' Capital and Distributions
Noncontrolling interests in subsidiaries (percent)	69.00%
Series B Preferred Units | PAA
Partners' Capital and Distributions
Noncontrolling interests in subsidiaries (percent)	100.00%