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Organization and Basis of Consolidation and Presentation (Details)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
segment
Sep. 30, 2021
segment
Dec. 31, 2021
USD ($)
segment
shares
Dec. 31, 2020
USD ($)
Organization and basis of presentation        
Operating segments number | segment 2 3 2  
Deferred tax asset | $ $ 1,362   $ 1,362 $ 1,444
Consolidated Entity Excluding VIE        
Organization and basis of presentation        
Deferred tax asset | $ $ 1,362   $ 1,362 $ 1,444
AAP        
Organization and basis of presentation        
Consolidated subsidiary, ownership interest (as a percent)     81.00%  
Consolidated subsidiary, ownership interest (in units)     193.2  
AAP | GP LLC        
Organization and basis of presentation        
Consolidated subsidiary, ownership interest (in units)     1.0  
PAA | AAP        
Organization and basis of presentation        
Consolidated subsidiary, ownership interest (as a percent)     31.00%  
Consolidated subsidiary, ownership interest (in units)     241.5  
GP LLC        
Organization and basis of presentation        
Consolidated subsidiary, ownership interest (as a percent)     100.00%