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Partners' Capital and Distributions - Issuance of PNG Common Units (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Noncontrolling Interests in Subsidiaries                      
Issuance of PNG common units (in units)                 22,133,904    
Net Income attributable to PAA                      
Net income attributable to PAA $ 247 $ 249 $ 124 $ 283 $ 389 $ 323 $ 287 $ 384 $ 903 $ 1,384 $ 1,361
Transfers to/from noncontrolling interests:                      
Net transfers to/from noncontrolling interests                     12
Partners' Capital Excluding Noncontrolling Interests                      
Transfers to/from noncontrolling interests:                      
Net transfers to/from noncontrolling interests                     475
Partners' Capital Excluding Noncontrolling Interests | PNG                      
Net Income attributable to PAA                      
Net income attributable to PAA                     1,361
Transfers to/from noncontrolling interests:                      
Increase in capital from sale of PNG common units                     8
Decrease in capital from purchase of PNG common units in conjunction with the PNG Merger                     (290)
Net transfers to/from noncontrolling interests                     (282)
Change from net income attributable to PAA and net transfers to/from noncontrolling interests                     $ 1,079
PNG Common Unit Issuance                      
Noncontrolling Interests in Subsidiaries                      
Issuance of PNG common units (in units)                     1,900,000
Increase in noncontrolling interest from PNG common unit issuances                     $ 32
PNG Common Unit Issuance | Partners' Capital Excluding Noncontrolling Interests                      
Transfers to/from noncontrolling interests:                      
Increase in capital from sale of PNG common units                     $ 8