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Equity-Indexed Compensation Plans - Plan Information (Details) - USD ($)
shares in Millions, $ in Millions
Dec. 31, 2021
May 31, 2021
Equity-Indexed Compensation Plans    
LTIP awards authorized (in shares or units) 47.3  
Currently available (in units) 26.0  
Probable vesting, unrecognized fair value $ 46  
Plains GP Holdings, L.P. Long-Term Incentive Plan    
Equity-Indexed Compensation Plans    
LTIP awards authorized (in shares or units) 3.8  
Units outstanding (in units) 0.3  
Units outstanding that include DERs (in units) 0.3  
Plains All American 2021 Long-Term Incentive Plan    
Equity-Indexed Compensation Plans    
LTIP awards authorized (in shares or units) 28.8 20.0
Plains All American PNG Successor Long-Term Incentive Plan    
Equity-Indexed Compensation Plans    
LTIP awards authorized (in shares or units) 1.3  
Plains All American GP LLC 2006 Long-Term Incentive Tracking Unit Plan    
Equity-Indexed Compensation Plans    
LTIP awards authorized (in shares or units) 13.4  
PAA LTIP | PAA    
Equity-Indexed Compensation Plans    
Units outstanding (in units) 10.7  
Units outstanding that include DERs (in units) 7.6