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Related Party Transactions (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related Party Transactions        
Revenues from related parties   $ 692 $ 1,067 $ 927
Purchases and related costs from related parties   223 410 286
Trade accounts receivable and other receivables, net from related parties   134 144  
Trade accounts payable to related parties   102 121  
GP        
Related Party Transactions        
Costs reimbursed to general partner   $ 580 494 $ 489
Equity Method Investees | Agreement to Transport Crude Oil        
Related Party Transactions        
Ownership interest   50.00%    
Common Units        
Related Party Transactions        
Issuance of units (in units)       54,119,893
Omnibus Agreement        
Related Party Transactions        
Expenses paid on behalf of affiliates   $ 4 $ 4 $ 4
Continuous Offering Program | Common Units        
Related Party Transactions        
Issuance of units (in units)       4,033,567
Continuous Offering Program | Omnibus Agreement | Common Units | AAP        
Related Party Transactions        
Issuance of units (in units)       1,800,000
Underwritten Offering | Omnibus Agreement | Common Units | AAP        
Related Party Transactions        
Issuance of units (in units) 48,300,000      
PAGP | Class C Shares        
Related Party Transactions        
Class C Shares of PAGP Owned   549,538,139 516,938,280  
AAP | Principal Owner        
Related Party Transactions        
Limited partner interest   10.00%