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Equity-Indexed Compensation Plans - Plan Information (Details) - shares
shares in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity-Indexed Compensation Plans        
LTIP awards authorized (in units) 25.2      
LTIP awards available (in units) 5.9      
LTIP awards outstanding (in units) 7.1 6.8 7.3 8.9
LTIP awards outstanding including DERs (in units) 5.4      
Plains All American 2013 Long-Term Incentive Plan        
Equity-Indexed Compensation Plans        
LTIP awards authorized (in units) 13.1      
Plains All American PNG Successor Long-Term Incentive Plan        
Equity-Indexed Compensation Plans        
LTIP awards authorized (in units) 1.3      
Plains All American GP LLC 2006 Long-Term Incentive Tracking Unit Plan        
Equity-Indexed Compensation Plans        
LTIP awards authorized (in units) 10.8