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Partners' Capital and Distributions - AAP Distributions (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 14, 2022
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Partners Capital and Distribution [Line Items]          
Total distributions paid     $ 729 $ 863 $ 1,208
AAP | Cash Distribution          
Partners Capital and Distribution [Line Items]          
Distributions to noncontrolling interests     36 57 141
Distributions paid to limited partners     176 223 372
Red River Pipeline Company LLC          
Partners Capital and Distribution [Line Items]          
Distributions to noncontrolling interests     14 10 6
PAA | Cash Distribution | Common Units          
Partners Capital and Distribution [Line Items]          
Distributions paid to limited partners     517 655 1,004
PAA | Cash Distribution | AAP | Common Units          
Partners Capital and Distribution [Line Items]          
Distributions paid to limited partners     $ 176 $ 223 $ 372
PAA | Cash Distribution | Subsequent Event | Common Units          
Partners Capital and Distribution [Line Items]          
Distributions paid to limited partners $ 127        
Plains Oryx Permian Basin LLC (Permian JV) | Subsequent Event          
Partners Capital and Distribution [Line Items]          
Distributions to noncontrolling interests   $ 54      
Fourth quarter distribution | AAP | Cash Distribution | Subsequent Event          
Partners Capital and Distribution [Line Items]          
Distributions to noncontrolling interests 8        
Fourth quarter distribution | PAA | Cash Distribution | Subsequent Event | AAP | Common Units          
Partners Capital and Distribution [Line Items]          
Distributions paid to limited partners $ 43