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Equity Compensation Plans (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Oct. 02, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
PAA Long-term Incentive Plan Awards
Dec. 31, 2011
PAA Long-term Incentive Plan Awards
Dec. 31, 2010
PAA Long-term Incentive Plan Awards
Dec. 31, 2012
PNG LTIP Awards Including Transaction Grants
Dec. 31, 2011
PNG LTIP Awards Including Transaction Grants
Dec. 31, 2010
PNG LTIP Awards Including Transaction Grants
Dec. 31, 2012
PNG LTIP Awards Including Transaction Grants
Maximum
Dec. 31, 2010
PNG LTIP Awards Including Transaction Grants
Maximum
Sep. 30, 2010
PNG Transaction Grants
Dec. 31, 2012
PNG Transaction Grants
Share-based Compensation Arrangement, by Share-based Payment Award                            
Accrued liability related to all outstanding LTIP awards and DERs   $ 90 $ 138                      
Short-term accrued liability related to all outstanding LTIP awards and DERs   44                        
Long-term accrued liability related to all outstanding LTIP awards and DERs   46                        
Equity compensation expense                       $ 1    
Outstanding (in units)                            
Outstanding at beginning of period (in units)         8,000,000 8,800,000 7,800,000 800,000 1,000,000          
Granted (in units)         1,500,000 1,000,000 4,000,000 100,000   1,100,000     375,000  
Vested (in units)         (3,200,000) (1,400,000) (2,200,000)   (100,000)   (100,000)     (125,000)
Cancelled or forfeited (in units)         (300,000) (400,000) (800,000)   (100,000) (100,000)        
Outstanding at end of period (in units)         6,000,000 8,000,000 8,800,000 900,000 800,000 1,000,000        
Annualized distribution probable of occurring         $ 2.45 $ 2.175                
Weighted Average Grant Date Fair Value per unit                            
Outstanding at beginning of period (in dollars per unit)         $ 21.77 $ 20.85 $ 18.20 $ 20.55 $ 20.55          
Granted (in dollars per unit)         $ 33.90 $ 27.53 $ 22.83 $ 15.33   $ 20.49        
Vested (in dollars per unit)         $ 19.82 $ 20.34 $ 16.10 $ 23.64 $ 23.62          
Cancelled or forfeited (in dollars per unit)         $ 29.36 $ 20.99 $ 17.81   $ 19.20 $ 19.22        
Outstanding at end of period (in dollars per unit)         $ 25.55 $ 21.77 $ 20.85 $ 17.49 $ 20.55 $ 20.55        
Units issued in connection with the settlement of vested awards, net of tax withholding (in units)   1,000,000 400,000 600,000 1,000,000                  
Units withheld for taxes (in units)   500,000 200,000 400,000 500,000                  
Vested awards settled in cash (in units)   1,700,000 800,000 1,200,000 1,700,000                  
Unit split conversion ratio 2