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Partners' Capital and Distributions (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 18, 2013
Partners Capital and Distribution    
Net proceeds from Sale $ 131.0  
PNG
   
Partners Capital and Distribution    
Noncontrolling interests, ownership percentage of noncontrolling owners 36.00%  
SLC Pipeline
   
Partners Capital and Distribution    
Noncontrolling interests, ownership percentage of noncontrolling owners 25.00%  
PAA Continuous Offering Program
   
Partners Capital and Distribution    
Units Sold 2,400,000  
Net proceeds from Sale 131.0  
Commissions paid 1  
PNG Continuous Offering Program | PNG
   
Partners Capital and Distribution    
Maximum aggregate offer price of common stock   75
Units Sold 57,000  
Net proceeds from Sale $ 1.2