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Acquisitions, Divestitures and Other Transactions - Pro Forma (Details) - Plains Oryx Permian Basin LLC - Oryx Midstream Holdings LLC - Joint Venture Transaction
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
Business Acquisition [Line Items]  
Total revenues $ 42,359
Net income attributable to PAA 524
Net income allocated to common unitholders $ 324
Basic net income per common unit (in dollar per unit) | $ / shares $ 0.45
Diluted net income per common unit (in dollar per unit) | $ / shares $ 0.45