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Debt (Details 2) (Terminated PAA senior unsecured 364-day revolving credit agreement, USD $)
In Billions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Terminated PAA senior unsecured 364-day revolving credit agreement
 
Debt  
Borrowing capacity $ 1.2
Period for activation of credit facility (in months) 6 months
Tenure of credit facility 364 days