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Partners' Capital and Distributions (Details 7) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended
May 31, 2012
May 31, 2011
Feb. 28, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Common Units
Dec. 31, 2010
Common Units
Dec. 31, 2012
PNG
Series A Subordinated Units
Dec. 31, 2010
PNG
Series A Subordinated Units
Dec. 31, 2012
PNG
Series B Subordinated Units
Dec. 31, 2010
PNG
Series B Subordinated Units
May 31, 2012
PNG
Common Units
May 31, 2011
PNG
Common Units
Feb. 28, 2011
PNG
Common Units
Dec. 31, 2012
PNG
Common Units
Dec. 31, 2010
PNG
Common Units
May 31, 2012
PNG
Private Placement
May 31, 2011
PNG
Private Placement
Feb. 28, 2011
PNG
Private Placement
Dec. 31, 2012
PNG
Private Placement
Dec. 31, 2011
PNG
Private Placement
Dec. 31, 2010
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Private Placement
Apr. 30, 2010
PNGS
Partners Capital and Distribution                                                
Number of common units issued representing limited partner interest (in units)                                       17,400,000        
Net proceeds from private placement on PNG common units                                       $ 370        
Proceeds received by PNG from Plains for sale of common units                                       230        
Contribution from general partner                                       12        
Number of common units transfer to noncontrolling interests in connection with the settlement of equity compensation awards (in shares) (100,000) (100,000)                     (100,000) (100,000)       (58,672) (58,672)          
Noncontrolling Interest, Ownership interest of reporting entity (as a percent)                                         64.00% 64.00% 77.00% 100.00%
Number of common units issued to Plains (in units)                                       10,200,000        
General Partner Interest in PNG (as a percent)                                         2.00%      
PNG units owned by PAA (in units)         43,500,000 53,600,000     11,900,000 11,900,000 13,500,000 13,500,000       28,200,000 18,100,000              
Units purchased (in units)     10,200,000                       10,200,000                  
Non-controlling interests associated with the book value of PNG sold to third parties       370 268   63 99                       306        
Increase to partners' capital                                       $ 64