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Equity Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
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, 2008
PAA Long-term Incentive Plans
Dec. 31, 2011
PAA Long-term Incentive Plans
Range of annualized vesting distribution amount from $3.75 to $4.45
Dec. 31, 2011
PAA Long-term Incentive Plans
Range of annualized vesting distribution amount from $3.80 to $4.25
Dec. 31, 2011
Employees and Directors LTIP
Dec. 31, 2011
Non-officer Employee Long-term Incentive Tracking Unit Plan
Feb. 28, 2012
PNG Long Term Incentive Plan Awards
Dec. 31, 2011
PNG Long Term Incentive Plan Awards
Dec. 31, 2010
PNG Long Term Incentive Plan Awards
Dec. 31, 2011
PNG Long Term Incentive Plan Awards
Range of annualized vesting distribution amount from $1.55 to $1.90
Dec. 31, 2011
PNG Long Term Incentive Plan Awards
Other ranges of annualized vesting distribution
Feb. 02, 2012
Awards associated with DERs that begin payment in February 2012
Feb. 02, 2012
Awards associated with DERs that begin payment in May 2013
Feb. 29, 2012
Awards associated with DERs that begin payment in May 2014
Feb. 02, 2012
Awards associated with DERs that begin payment in May 2014
Sep. 30, 2010
PNG Transaction Grants
Dec. 31, 2011
PNG Transaction Grants
Share-based Compensation Arrangement, by Share-based Payment Award                                          
Authorized grants (in units)                 5,400,000 2,100,000   3,000,000                  
Units Outstanding (in units)     4,000,000 4,400,000 3,900,000 3,900,000 2,600,000 1,400,000       500,000   300,000 200,000 70,000 70,000        
Units Outstanding (in units)                                   the remainder      
Annualized distribution threshold of units with associated DERs (in dollars per share)                               $ 1.45 $ 1.50   $ 1.55    
Estimated unit vesting in 2012 (in units)     1,500,000       900,000 600,000                          
Estimated unit vesting in 2013 (in units)     1,100,000       600,000 500,000       100,000     100,000            
Estimated unit vesting in 2014 (in units)     700,000       500,000 200,000       100,000     100,000            
Estimated unit vesting in 2015 (in units)     700,000       600,000 100,000       100,000   100,000              
Estimated unit vesting thereafter (in units)                       200,000   200,000              
PNG annualized distribution probable of occurring     $ 4.35 $ 4.00               $ 1.45 $ 1.45                
Annualized distribution, low end of range (in dollars per unit)             $ 3.75 $ 3.80           $ 1.55              
Annualized distribution, high end of range (in dollars per unit)             $ 4.45 $ 4.25           $ 1.90              
Award vesting rights (as a percent)               fifty percent     fifty percent                    
Units outstanding that include DERs (in units)     2,200,000                 300,000                  
DERs currently vested (in units)     1,700,000                                    
Accrued liability related to all outstanding LTIP awards and DERs $ 138 $ 102                                      
Phantom common units granted (in units)                     232,500                 375,000  
Phantom common units granted associated with the conversion of Series A and Series B subordinated units (in units)                     232,500                    
Units vested (in units)     700,000 1,100,000 600,000                               62,500