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Equity Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2012
Mar. 31, 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
Mar. 31, 2012
PAA Long-term Incentive Plans
Mar. 31, 2012
PNG LTIP Awards Including Transaction Grants
Mar. 31, 2012
AAP LP Class B Units
Dec. 31, 2011
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 granted (in units)     232,500              
Phantom common units granted associated with the conversion of Series A and Series B subordinated units (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)             (800,000)      
Earned (in units)                 (24,250)  
Outstanding at end of period (in units)       70,000 70,000   3,900,000 900,000    
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)             $ 65.63 $ 15.05    
Vested (in dollars per unit)             $ 37.85      
Outstanding at end of period (in dollars per unit)             $ 48.65 $ 17.97    
Units issued in connection with the settlement of vested awards, net of tax withholding (in units)             200,000      
Units issued in connection with tax withholding on units vested (in units)             100,000      
Vested awards settled in cash (in units)             500,000      
Units Outstanding (in units)                 183,500 183,500
Outstanding Units Earned (in units)                 104,313  
Reserved for future issuances                 16,500  
Other Consolidated Equity Compensation Information                    
Equity compensation expense $ 39 $ 20                
LTIP unit settled vestings 24                  
LTIP cash settled vestings 36                  
DER cash payments $ 2 $ 1