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Noncontrolling Interests (Detail) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Western Gas Equity Partners, LP [Member]        
Noncontrolling Interest [Line Items]        
Common units issued to the public 12,500      
Net proceeds from common units $ 476      
Western Gas Equity Partners, LP [Member] | Limited Partner [Member]        
Noncontrolling Interest [Line Items]        
Ownership interest in subsidiary     81.60%  
Public ownership interest in subsidiary     18.40%  
Western Gas Partners, LP [Member]        
Noncontrolling Interest [Line Items]        
Units issued in private placement   1,300    
Common units issued to the public       874
Net proceeds from common units       $ 57
Western Gas Partners, LP [Member] | Limited Partner [Member]        
Noncontrolling Interest [Line Items]        
Public ownership interest in subsidiary     60.00%  
Western Gas Partners, LP [Member] | Limited Partner [Member] | Western Gas Equity Partners, LP Ownership Interest in Western Gas Partners, LP [Member]        
Noncontrolling Interest [Line Items]        
Ownership interest in subsidiary     30.00%  
Western Gas Partners, LP [Member] | Limited Partner [Member] | Anadarko Limited Partner Interest in WES Owned Through Other Subsidiaries [Member]        
Noncontrolling Interest [Line Items]        
Ownership interest in subsidiary     8.50%  
Western Gas Partners, LP [Member] | General Partner [Member] | Western Gas Equity Partners, LP Ownership Interest in Western Gas Partners, LP [Member]        
Noncontrolling Interest [Line Items]        
Ownership interest in subsidiary     1.50%  
Series A Preferred Units [Member] | Western Gas Partners, LP [Member]        
Noncontrolling Interest [Line Items]        
Units issued in private placement 8,000 14,000    
Net proceeds from Series A preferred units $ 247 $ 440    
Class C Units [Member] | Western Gas Partners, LP [Member]        
Noncontrolling Interest [Line Items]        
Units issued in private placement     749 498