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Organization and Basis of Consolidation and Presentation (Details)
shares in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2021
segment
Sep. 30, 2021
segment
Dec. 31, 2021
segment
shares
Organization and basis of presentation      
Operating segments number | segment 2 3 2
AAP | PAGP      
Organization and basis of presentation      
Limited partner interest     81.00%
PAA | AAP      
Organization and basis of presentation      
Limited partner interest (in units) | shares     241.5
Limited partner interest     31.00%