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Related Party Transactions (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended 22 Months Ended
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Nov. 14, 2016
Related Party Transactions            
Limited partner interest           98.00%
General Partner            
Related Party Transactions            
Costs reimbursed to general partner     $ 489 $ 514 $ 648  
Oxy            
Related Party Transactions            
Revenues     920 655 866  
Purchases and related costs     (253) 42 41  
Trade accounts receivable and other receivables $ 1,075   1,075 789    
Accounts payable 990   990 836    
Equity Method Investees            
Related Party Transactions            
Revenues     3 14 17  
Trade accounts receivable and other receivables 26   26 39    
Accounts payable $ 41   41 35    
Costs related to services utilized     $ 434 209 $ 164  
Prepaid tariff costs       $ 14    
Equity Method Investees | Agreement to Transport Crude Oil            
Related Party Transactions            
Ownership interest 50.00%   50.00%      
Class C Shares | PAGP            
Related Party Transactions            
Class C shares of PAGP held by PAA     510,925,432 491,910,863    
Common Units            
Related Party Transactions            
Issuance of units (in units)     54,119,893   22,133,904  
Omnibus Agreement            
Related Party Transactions            
Expenses paid on behalf of affiliates     $ 4 $ 4    
AAP            
Related Party Transactions            
Limited partner interest     36.00%      
AAP | PAGP            
Related Party Transactions            
Limited partner interest     55.00%      
AAP | Oxy            
Related Party Transactions            
Limited partner interest 11.00%          
Continuous Offering Program | Common Units            
Related Party Transactions            
Issuance of units (in units)     4,033,567 26,278,288 1,133,904  
Continuous Offering Program | Omnibus Agreement | Common Units | AAP            
Related Party Transactions            
Issuance of units (in units)     1,800,000      
Underwritten Offering | Common Units            
Related Party Transactions            
Issuance of units (in units)         21,000,000  
Underwritten Offering | Omnibus Agreement | Common Units | AAP            
Related Party Transactions            
Issuance of units (in units)   48,300,000 48,300,000