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Equity-Indexed Compensation Plans - Liability and Activity (Details) - PAA LTIP - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity-Indexed Compensation Plans        
Annualized distribution probable of occurring (in dollars per unit)   $ 2.2    
Outstanding (in units)        
Outstanding at beginning of period (in units)   6.9 7.3 8.4
Granted (in units)   4.5 2.1 1.2
Vested (in units)   (1.9) (2.1) (1.9)
Modified (in units) 2.2      
Cancelled or forfeited (in units)   (0.6) (0.4) (0.4)
Outstanding at end of period (in units)   8.9 6.9 7.3
Weighted Average Grant Date Fair Value per Unit        
Outstanding at beginning of period (in dollars per unit)   $ 41.23 $ 41.45 $ 36.97
Granted (in dollars per unit)   23.38 28.76 47.68
Vested (in dollars per unit)   45.91 28.91 25.49
Modified (in dollars per unit)   (8.21)    
Cancelled or forfeited (in dollars per unit)   37.19 44.56 40.14
Outstanding at end of period (in dollars per unit)   $ 29.62 $ 41.23 $ 41.45
Units issued in connection with the settlement of vested awards, net of tax withholding (in units)   0.5 0.5 0.6
Units withheld for taxes (in units)   0.3 0.3 0.3
Vested awards settled in cash (in units)   1.1 1.3 1.0
Liability Awards        
Equity-Indexed Compensation Plans        
Accrued liability related to all outstanding LTIP awards and DERs   $ 38 $ 33  
Short-term accrued liability related to all outstanding LTIP awards and DERs   25 20  
Long-term accrued liability related to all outstanding LTIP awards and DERs   $ 13 $ 13  
Annualized distribution probable of occurring (in dollars per unit) $ 2.2