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Debt (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Short-term debt:    
Other short-term debt $ 3 $ 4
Total short-term debt 879 1,113
Long-term debt:    
Senior notes, net of unamortized discounts of $14 and $15, respectively 6,711 6,710
Unamortized discounts 14 15
Long-term debt, other 5 5
Total long-term debt 6,818 6,715
Total debt 7,697 7,828
Senior notes
    
Long-term debt:    
Senior notes, net of unamortized discounts of $14 and $15, respectively 6,711 6,710
Unamortized discounts 14 15
Commercial paper notes
    
Short-term debt:    
PAA commercial paper notes, short-term 876 1,109
Repayment period 1 year  
Weighted average interest rate, short-term (as a percent) 0.30% 0.33%
Long-term debt:    
PAA commercial paper notes, long-term $ 102  
Weighted average interest rate, long-term (as a percent) 0.30%