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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transactions      
Revenues from related parties $ 46 $ 692 $ 1,067
Purchases and related costs from related parties 451 223 410
Trade accounts receivable and other receivables, net from related parties 34 134  
Trade accounts payable to related parties 88 102  
GP      
Related Party Transactions      
Costs reimbursed to general partner $ 553 580 494
Equity Method Investees | Agreements to store at facilities or transport on pipelines owned by equity method investees      
Related Party Transactions      
Ownership interest in unconsolidated entity 50.00%    
Omnibus Agreement      
Related Party Transactions      
Expenses paid on behalf of affiliates $ 5 $ 4 $ 4
PAGP | Class C Shares      
Related Party Transactions      
Class C Shares of PAGP Owned 547,717,762 549,538,139  
AAP | Principal Owner | Minimum      
Related Party Transactions      
Limited partner interest 10.00%