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Related Party Transactions - Promissory Notes with our General Partner (Details)
$ in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 16 Months Ended
Jul. 31, 2024
CAD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2023
CAD ($)
Related Party Transaction [Line Items]                
Related party interest expense   $ 111 $ 95 $ 205 $ 193      
PAGP | 8.25% note due April 2027 | General Partner                
Related Party Transaction [Line Items]                
Related party note receivable   365   365   $ 365 $ 379 $ 500
Related party note payable   365   365   $ 365 379 $ 500
Related party note payable and receivable interest rate (as a percent)           8.25%    
Related party interest receivable   10   10   $ 10 10  
Related party interest payable   10   10   $ 10 $ 10  
Related party interest income   7 7 15 10      
Related party interest expense   $ 7 $ 7 $ 15 $ 10      
PAGP | 6.50% note due September 2034 | General Partner | Subsequent Event                
Related Party Transaction [Line Items]                
Related party note receivable $ 865              
Related party note payable $ 865              
Related party note payable and receivable interest rate (as a percent) 6.50%