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Equity Compensation Plans (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
PAA Long-term Incentive Plans
Dec. 31, 2010
PAA Long-term Incentive Plans
Dec. 31, 2009
PAA Long-term Incentive Plans
Dec. 31, 2011
PNG LTIP Awards Including Transaction Grants
Dec. 31, 2010
PNG LTIP Awards Including Transaction Grants
Dec. 31, 2008
PNG LTIP Awards Including Transaction Grants
Dec. 31, 2010
PNG LTIP Awards Including Transaction Grants
Maximum
Dec. 31, 2011
AAP LP Class B Units
Dec. 31, 2010
AAP LP Class B Units
Share-based Compensation Arrangement, by Share-based Payment Award                        
Equity compensation expense $ 110 $ 98 $ 68               $ 9 $ 9
Outstanding (in units)                        
Outstanding at beginning of period (in units)       4,400,000 3,900,000 3,900,000 1,000,000   0      
Granted (in units)       500,000 2,000,000 600,000   1,100,000        
Vested (in units)       (700,000) (1,100,000) (600,000) (100,000)          
Cancelled or forfeited (in units)       (200,000) (400,000) (100,000) (100,000) (100,000)        
Acquired (in units)           100,000            
Outstanding at end of period (in units)       4,000,000 4,400,000 3,900,000 800,000 1,000,000 0      
Weighted Average Grant Date Fair Value per unit                        
Outstanding at beginning of period (in dollars per unit)       $ 41.69 $ 36.40 $ 36.44 $ 20.55   $ 0      
Granted (in dollars per unit)       $ 55.05 $ 45.66 $ 32.20   $ 20.49        
Vested (in dollars per unit)       $ 40.68 $ 32.20 $ 34.55 $ 23.62          
Cancelled or forfeited (in dollars per unit)       $ 41.97 $ 35.62 $ 37.82 $ 19.20 $ 19.22        
Acquired (in dollars per unit)           $ 26.24            
Outstanding at end of period (in dollars per unit)       $ 43.53 $ 41.69 $ 36.40 $ 20.55 $ 20.55 $ 0      
Other Consolidated Equity Compensation Information                        
Equity compensation expense                   1    
LTIP unit settled vestings 24 26 19                  
LTIP cash settled vestings 19 36 8                  
DER cash payments 4 4 4                  
Unit vestings which were settled with PNG units 2                      
Units issued in connection with the settlement of vested awards, net of tax withholding (in units) 200,000 300,000 300,000                  
Units issued in connection with tax withholding on units vested (in units) 100,000 200,000 200,000                  
Vested awards settled in cash (in units) 400,000 600,000 100,000                  
Additional expense expected to be recognized over life of outstanding awards related to remaining unrecognized fair value 90                      
Equity Compensation Plan Fair Value Amortization                        
2012 50                      
2013 26                      
2014 11                      
2015 3                      
Total $ 90