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Equity-Indexed Compensation Plans - PAGP LTIP (Details) - PAGP LTIP - Class A Shares - $ / shares
1 Months Ended 12 Months Ended
Feb. 28, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity-Indexed Compensation Plans        
Authorized grants (in shares or units)   3,800,000    
Directors        
Equity-Indexed Compensation Plans        
Granted (in shares or units) 31,242      
Awards outstanding (Less than 0.1 million in 2016, 2015 and 2014) (in units)   100,000 100,000 100,000
Weighted average grant date fair value   $ 59.63 $ 74.14 $ 74.14
Vested (less than 0.1 million in 2016 and 2015) (in shares or units)   100,000 100,000  
Directors | PAGP LTIP Awards Vesting Annually        
Equity-Indexed Compensation Plans        
Percentage increment of vesting of awards   25.00%