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Equity Compensation Plans (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 1 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Feb. 29, 2012
PNG Long Term Incentive Plan Awards
Feb. 29, 2012
Awards associated with DERs that begin payment in February 2012
Feb. 29, 2012
Awards associated with DERs that begin payment in May 2013
Feb. 29, 2012
Awards associated with DERs that begin payment in May 2014
Jun. 30, 2012
PAA Long-term Incentive Plan Awards
Jun. 30, 2012
PNG LTIP Awards Including Transaction Grants
Jun. 30, 2012
PNG LTIP Awards Including Transaction Grants
Maximum
Jun. 30, 2012
AAP LP Class B Units
Share-based Compensation Arrangement, by Share-based Payment Award                        
Units Outstanding (in units)               the remainder        
Annualized distribution threshold of units with associated DERs (in dollars per share)           $ 1.45 $ 1.50 $ 1.55        
Award vesting rights (as a percent)         fifty percent              
Phantom common units for which vesting criteria was modified (in units)         232,500              
Phantom common units associated with the conversion of Series A and Series B subordinated units for which vesting criteria was modified (in units)         232,500              
Outstanding (in units)                        
Outstanding at beginning of period (in units)           70,000 70,000   4,000,000 800,000    
Granted (in units)                 700,000 100,000    
Vested (in units)                 (1,500,000)   (100,000)  
Cancelled or forfeited (in units)                 (100,000)      
Outstanding at end of period (in units)           70,000 70,000   3,100,000 900,000    
Weighted Average Grant Date Fair Value per unit                        
Outstanding at beginning of period (in dollars per unit)                 $ 43.53 $ 20.55    
Granted (in dollars per unit)                 $ 66.28 $ 15.05    
Vested (in dollars per unit)                 $ 39.30 $ 23.67    
Cancelled or forfeited (in dollars per unit)                 $ 59.32      
Outstanding at end of period (in dollars per unit)                 $ 50.58 $ 17.56    
Units issued in connection with the settlement of vested awards, net of tax withholding (in units)                 400,000      
Units withheld for taxes (in units)                 300,000      
Vested awards settled in cash (in units)                 800,000      
Other Consolidated Equity Compensation Information                        
Equity compensation expense $ 20 $ 27 $ 60 $ 46               $ 5
LTIP unit settled vestings 33 23 58 23                
LTIP cash settled vestings 29 18 65 18                
DER cash payments 2 1 4 2                
Unit vestings which were settled with PNG units $ 1 $ 1 $ 1 $ 1