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Debt (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Short-term debt:    
Other short-term debt $ 3 $ 2
Total short-term debt 902 1,086
Long-term debt:    
Senior notes, net of unamortized discounts 6,011 6,010
Unamortized discount 14 15
Long-term debt, other 5 5
Total long-term debt 6,313 6,320
Total debt 7,215 7,406
PAA senior secured hedged inventory facility maturing in August 2014
    
Debt    
Credit facility, interest rate (as a percent) 1.30% 1.60%
Short-term debt:    
Credit Facility, Current 575 665
PAA senior unsecured revolving credit facility maturing in August 2016
    
Debt    
Credit facility, interest rate (as a percent) 3.20% 2.40%
Short-term debt:    
Credit Facility, Current 25 92
Repayment period 1 year  
5.63% senior notes due December 2013
    
Debt    
Debt instrument, interest rate (as a percent) 5.63% 5.63%
Short-term debt:    
Senior Notes, Current 250 250
PNG senior unsecured credit facility
    
Debt    
Credit facility, interest rate (as a percent) 2.00% 2.10%
Short-term debt:    
Credit Facility, Current 49 77
Repayment period 1 year  
Long-term debt:    
Long-term debt under credit facilities 97 105
PNG GO Bond term loans
    
Debt    
Term Loans, interest rate (as a percent) 1.50% 1.50%
Long-term debt:    
Term Loans, amounts outstanding $ 200 $ 200