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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
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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

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