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Equity-Indexed Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
PAGP LTIP
Sep. 30, 2014
PAGP LTIP
Class A Shares
Feb. 28, 2014
PAGP LTIP
Class A Shares
Directors
Sep. 30, 2014
PAGP LTIP
Class A Shares
Directors
Sep. 30, 2014
PAGP LTIP
Class A Shares
Directors
PAGP LTIP Awards Vesting Annually
Sep. 30, 2014
PAA LTIP
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         1,100,000
Vested (in shares or units)                   (1,900,000)
Cancelled or forfeited (in shares or units)                   (300,000)
Outstanding at end of period (in shares or units)         100,000         7,300,000
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         $ 47.27
Vested (in dollars per share or unit)                   $ 25.54
Cancelled or forfeited (in dollars per share or unit)                   $ 39.63
Outstanding at end of period (in dollars per share or unit)         $ 27.84         $ 41.28
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)                   1,000,000
Other Consolidated Equity-Indexed Compensation Information                    
Equity-indexed compensation expense $ 22 $ 17 $ 91 $ 96       $ 1    
LTIP unit-settled vestings 1 1 52 47            
LTIP cash-settled vestings     52 61            
DER cash payments $ 2 $ 2 $ 6 $ 5            
Percentage increment of vesting of awards                 25.00%