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Acquisitions, Divestitures and Other Transactions - Pro Forma (Details) - Plains Oryx Permian Basin LLC (Permian JV) - Oryx Midstream Holdings LLC - Joint Venture Transaction - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |
Total revenues | $ 42,359 | $ 23,536
Net income/(loss) attributable to PAA | 524 | (2,898)
Net income/(loss) allocated to common unitholders | $ 324 | $ (3,098)
Basic net income/(loss) per common unit (in shares) | $ 0.45 | $ (4.26)
Diluted net income/(loss) per common unit (in shares) | $ 0.45 | $ (4.26)

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