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Acquisitions and Dispositions (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 1 Months Ended
Dec. 31, 2009
Other 2009 Acquisitions
entity
Dec. 31, 2011
Other 2009 Acquisitions
Sep. 30, 2009
PNGS Acquisition
installment
Bcf
facility
Dec. 31, 2011
PNGS Acquisition
May 31, 2010
PNGS Acquisition
Dec. 31, 2010
Capline And associated Tankage
Dec. 31, 2009
Capline And associated Tankage
Business acquisition              
Number of additional acquisitions completed (in entities) 6            
Percentage of ownership acquired (as a percent)     50.00%     11.00% 21.00%
Ownership interest (in percent)     100.00%        
Percent ownership in PAA/Vulcan prior to acquisition of additional interest (as a percent)     50.00%        
Number of natural gas storage facilities owned and operated     2        
Volume of aggregate working gas storage capacity of natural gas storage facilities (in Bcf)     40        
Volume of aggregate peak injection capacity of natural gas storage facilities per day (in Bcf)     1.7        
Volume of aggregate peak withdrawal capacity of natural gas storage facilities per day (in Bcf)     3.2        
Business acquisition, purchase price              
Purchase price: Cash     $ 90        
Contingent consideration: Cash paid         20    
Remaining contingent consideration fair value       19      
Equivalent value of PAA common units issued at closing     91        
Equivalent value of PAA common units issued at closing (in common units)     1,907,305        
Purchase price: Valuation method used for price per common unit     20 business-day average closing price per unit        
Purchase price: Paid at closing     181        
Purchase price: Fair value of contingent consideration as of the acquisition date     34        
Number of installments for payment of contingent purchase consideration     2        
Business acquisition contingent consideration potential cash payable in each installment     20        
Potential contingent consideration     40        
Discount rate used for calculating present value of deferred contingent cash consideration (as a percent)     9.00%        
Total purchase price 178   215        
Net gain on pre-acquisition relationship     9        
Business acquisition, allocation of fair value of assets and liabilities              
Property, plant and equipment     791        
Base gas     28        
Purchase price allocation: Goodwill   27 25        
Intangible assets     23        
Working capital and other long-term assets and liabilities     9        
Debt     (446)        
Total assets and liabilities     $ 430