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Partners' Capital and Distributions (Details 9) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Nov. 30, 2011
Mar. 31, 2011
Nov. 30, 2010
Sep. 30, 2009
Mar. 31, 2009
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Partners Capital and Distribution                
Units Issued 6,000,000 7,935,000 4,780,000 5,290,000 5,750,000 13,935,000 4,780,000 11,040,000
Gross Unit Price (in dollars per unit) $ 65.03 $ 64.00 $ 62.60 $ 46.70 $ 36.90      
Proceeds from Sale $ 390 $ 508 $ 299 $ 247 $ 212 $ 898 $ 299 $ 459
General Partner Contribution 9 10 6 5 4 19 6 9
Costs (13) (15) (9) (6) (6) (28) (9) (12)
Net Proceeds 386 503 296 246 210 889 296 456
PNGS Acquisition
                
Partners Capital and Distribution                
Equivalent value of PAA common units issued at closing (in common units)       1,907,305        
Equivalent value of PAA common units issued at closing       91        
Contributions from general partner       $ 2