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Partners' Capital and Distributions - Subsidiary Sales of Common Units (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 9 Months Ended
Mar. 31, 2017
Sep. 30, 2017
Partners Capital and Distributions    
Sale of common units, net proceeds   $ 1,535
PAA    
Partners Capital and Distributions    
Noncontrolling interests in subsidiaries (percent)   64.00%
AAP    
Partners Capital and Distributions    
Noncontrolling interests in subsidiaries (percent)   46.00%
SLC Pipeline LLC    
Partners Capital and Distributions    
Noncontrolling interests in subsidiaries (percent)   25.00%
PAA | Continuous Offering Program | Common Units    
Partners Capital and Distributions    
Sale of common units (units)   4.0
Sale of common units, net proceeds   $ 129
Commissions paid to sales agents   $ 1
AAP | Omnibus Agreement | PAA | Continuous Offering Program | Common Units    
Partners Capital and Distributions    
Sale of common units (units)   1.8
AAP | Omnibus Agreement | PAA | Underwritten Offering | Common Units    
Partners Capital and Distributions    
Sale of common units (units) 48.3