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Organization and Basis of Consolidation and Presentation - Additional Information (Details)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
segment
shares
Dec. 31, 2020
USD ($)
Organization and basis of presentation    
Operating segments number | segment 3  
Deferred tax asset | $ $ 1,408 $ 1,444
PAA | AAP    
Organization and basis of presentation    
Ownership interest 31.00%  
Ownership interest (in units) 245.5  
GP LLC    
Organization and basis of presentation    
Ownership interest 100.00%  
AAP    
Organization and basis of presentation    
Ownership interest 79.00%  
Ownership interest (in units) 193.1  
AAP | GP LLC    
Organization and basis of presentation    
Ownership interest (in units) 1.0  
Consolidated Entity Excluding VIE    
Organization and basis of presentation    
Deferred tax asset | $ $ 1,408 $ 1,444