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Debt (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Short-term debt:    
Other short-term debt $ 4 $ 2
Total short-term debt 619 1,086
Long-term debt:    
Senior notes, net of unamortized discounts 6,710 6,010
Unamortized discount 15 15
Long-term debt, other 5 5
Total long-term debt 7,018 6,320
Total debt 7,637 7,406
Commercial paper notes
    
Debt    
Interest rate (as a percent) 0.25%  
Short-term debt:    
Commercial Paper Notes, Current 319  
Repayment period 1 year  
PAA senior secured hedged inventory facility maturing in August 2016
    
Debt    
Credit facility, interest rate (as a percent)   1.60%
Short-term debt:    
Credit Facility, Current   665
Repayment period 1 year  
PAA senior unsecured revolving credit facility maturing in August 2018
    
Debt    
Credit facility, interest rate (as a percent)   2.40%
Short-term debt:    
Credit Facility, Current   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 46 77
Repayment period 1 year  
Long-term debt:    
Long-term debt under credit facilities 103 105
PNG GO Bond term loans
    
Debt    
Interest rate (as a percent) 1.50% 1.50%
Long-term debt:    
Term Loans, amounts outstanding $ 200 $ 200