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Partners' Capital and Distributions (Details 8) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 3 Months Ended 12 Months Ended
Oct. 02, 2012
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Partners' Capital and Distributions                        
Net income attributable to Plains   $ 320 $ 165 $ 378 $ 230 $ 278 $ 281 $ 225 $ 182 $ 1,094 $ 966 $ 505
Transfers to the noncontrolling interests:                        
Increase in capital from sale of PNG units                     64 101
Change from net income attributable to Plains and net transfers to the noncontrolling interest                   1,094 1,030 606
Changes in the noncontrolling interests in partners' capital                        
Beginning balance         524         524    
Sale of noncontrolling interest in a subsidiary (Note 10)                     370 268
Net income attributable to noncontrolling interests   330 173 386 237 288 288 233 185 1,127 994 514
Equity compensation expense (Note 15)                   28 28 16
Distribution equivalent right payments (Note 15)                   (5)    
Other comprehensive income/(loss):                        
Reclassification adjustments                   (62) 131 (24)
Net deferred gain/(loss) on cash flow hedges                   44 (154) (73)
Other                       1
Ending Balance   509       524       509 524  
LTIP Vesting                        
Unit split conversion ratio 2                      
Issuance of common units under LTIP                   34 15 16
Noncontrolling Interests
                        
Changes in the noncontrolling interests in partners' capital                        
Beginning balance         524       231 524 231 63
Sale of noncontrolling interest in a subsidiary (Note 10)                     306 167
Net income attributable to noncontrolling interests                   33 28 9
Distribution to noncontrolling interest                   (48) (40) (10)
Equity compensation expense (Note 15)                   4 3 3
Distribution equivalent right payments (Note 15)                   (1)    
Other comprehensive income/(loss):                        
Reclassification adjustments                   (4)    
Net deferred gain/(loss) on cash flow hedges                   1 (4)  
Other                       (1)
Ending Balance   509       524       509 524 231
PAA Long-term Incentive Plan Awards
                        
LTIP Vesting                        
Unit split conversion ratio                   2    
Issuance of common units under LTIP (in units)                   1.0    
Issuance of common units under LTIP                   $ 34