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Equity-Indexed Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 83 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
PAGP LTIP
Jun. 30, 2014
PAGP LTIP
Class A Shares
Feb. 28, 2014
PAGP LTIP
Class A Shares
Directors
Jun. 30, 2014
PAGP LTIP
Class A Shares
Directors
Maximum
Jun. 30, 2014
PAGP LTIP
Class A Shares
Directors
PAGP LTIP Awards Vesting Annually
Jun. 30, 2014
PAA LTIP
Jun. 30, 2014
AAP Management Units
Jun. 30, 2014
AAP Management Units
Equity-indexed Compensation Plans                        
Authorized grants (in shares)           10,000,000            
Shares issued to directors             83,200          
Outstanding (in shares or units)                        
Outstanding at beginning of period (in shares or units)                   8,400,000    
Granted (in shares or units)         100,000         900,000    
Vested (in shares or units)                   (1,800,000)    
Cancelled or forfeited (in shares or units)                   (300,000)    
Outstanding at end of period (in shares or units)         100,000         7,200,000    
Weighted Average Grant Date Fair Value per share or unit                        
Outstanding at beginning of period (in dollars per share or unit)                   $ 36.97    
Granted (in dollars per share or unit)         $ 27.84         $ 46.61    
Vested (in dollars per share or unit)                   $ 25.39    
Cancelled or forfeited (in dollars per share or unit)                   $ 38.88    
Outstanding at end of period (in dollars per share or unit)         $ 27.84         $ 41.05    
Units issued in connection with the settlement of vested awards, net of tax withholding (in units)                   600,000    
Units withheld for taxes (in units)                   300,000    
Vested awards settled in cash (in units)                   900,000    
Reserved for Future Grants                        
Reserved for future grants outstanding, beginning balance (in units)                     3,500,000  
Granted (in units)                     (400,000)  
Reserved for future grants outstanding, ending balance (in units)                     3,100,000 3,100,000
Outstanding                        
Outstanding at the beginning of the period (in units)                     48,600,000  
Granted (in units)                     400,000  
Outstanding at the ending of the period (in units)                     49,000,000 49,000,000
Outstanding Units Earned                        
Outstanding Units Earned, beginning balance (in units)                     47,000,000  
Units earned (in units)                     800,000  
Outstanding Units Earned, end balance (in units)                     47,800,000 47,800,000
Grant Date Fair Value of Outstanding AAP Management Units:                        
Grant Date Fair Value of Outstanding AAP Management Units, beginning balance                     $ 51  
Units granted                     11  
Grant Date Fair Value of Outstanding AAP Management Units, ending balance                     62 62
Other Consolidated Equity-Indexed Compensation Information                        
Equity-indexed compensation expense 34 27 68 78       1     4 52
LTIP unit-settled vestings 44 46 51 46                
LTIP cash-settled vestings 51 60 52 60                
DER cash payments $ 2 $ 2 $ 4 $ 4                
Percentage increment of vesting of awards                 25.00%