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Equity Compensation Plans (Details 2) (USD $)
 0 Months Ended 9 Months Ended
Oct. 02, 2012
Sep. 30, 2012
Outstanding (in units)    
Unit split conversion ratio 2  
PAA Long-term Incentive Plan Awards
    
Outstanding (in units)    
Outstanding at beginning of period (in units) 6,000,000 8,000,000
Granted (in units)   1,400,000
Vested (in units)   (3,100,000)
Cancelled or forfeited (in units)   (300,000)
Outstanding at end of period (in units)   6,000,000
Unit split conversion ratio 2  
Weighted Average Grant Date Fair Value per unit    
Outstanding at beginning of period (in dollars per unit) $ 25.35 $ 21.77
Granted (in dollars per unit)   $ 33.32
Vested (in dollars per unit)   $ 19.65
Cancelled or forfeited (in dollars per unit)   $ 29.66
Outstanding at end of period (in dollars per unit)   $ 25.35
Units issued in connection with the settlement of vested awards, net of tax withholding (in units)   900,000
Units withheld for taxes (in units)   500,000
Vested awards settled in cash (in units)   1,700,000
PNG LTIP Awards Including Transaction Grants
    
Outstanding (in units)    
Outstanding at beginning of period (in units)   800,000
Granted (in units)   100,000
Outstanding at end of period (in units)   900,000
Weighted Average Grant Date Fair Value per unit    
Outstanding at beginning of period (in dollars per unit)   $ 20.55
Granted (in dollars per unit)   $ 15.33
Vested (in dollars per unit)   $ 23.64
Outstanding at end of period (in dollars per unit)   $ 17.49
PNG LTIP Awards Including Transaction Grants | Maximum
    
Outstanding (in units)    
Vested (in units)   (100,000)