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Debt (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Short-term debt:    
Other short-term debt $ 3 $ 4
Total short-term debt 763 1,113
Long-term debt:    
Senior notes, net of unamortized discounts of $16 and $15, respectively 7,409 6,710
Unamortized discounts 16 15
Long-term debt, other 5 5
Total long-term debt 7,414 6,715
Total debt 8,177 7,828
Senior notes
    
Long-term debt:    
Senior notes, net of unamortized discounts of $16 and $15, respectively 7,409 6,710
Unamortized discounts 16 15
5.25% senior notes maturing in June 2015
    
Long-term debt:    
Debt instrument, interest rate (as a percent) 5.25%  
Senior notes 150  
Commercial paper notes
    
Short-term debt:    
PAA commercial paper notes, bearing a weighted-average interest rate of 0.29% and 0.33%, respectively $ 760 $ 1,109
Weighted average interest rate, short-term (as a percent) 0.29% 0.33%