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Long-term Debt (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Sep. 23, 2015
New revolving credit facility      
Long-term debt      
Outstanding balance $ 0 $ 0  
Maximum amount of the Credit Facility 1,000 1,000 $ 1,500
Letter of credit      
Long-term debt      
Current borrowing capacity $ 150 150  
Line of credit | Minimum      
Long-term debt      
Commitment fees on the unused portion (as a percent) 0.25%    
Line of credit | Maximum      
Long-term debt      
Commitment fees on the unused portion (as a percent) 0.375%    
Antero Water Credit Facility      
Long-term debt      
Outstanding balance $ 153 $ 115  
Weighted average interest rate (as a percent) 1.94% 2.19%  
Antero Water Credit Facility | Minimum      
Long-term debt      
Commitment fees on the unused portion (as a percent) 0.375% 0.375%  
Antero Water Credit Facility | Maximum      
Long-term debt      
Commitment fees on the unused portion (as a percent) 0.50% 0.50%