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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]          
Contract with customer, asset, net $ 488,700   $ 488,700    
Revenues from contracts with customers 1,158,418   3,613,395    
(Loss) gain on derivatives not designated as hedges (3,075) $ 35,625 5,620 $ 222,693  
Other sources of revenue 452   33,729    
Total operating revenues 1,158,870 659,413 $ 3,647,124 2,242,324  
Gathering, Transmission, and Storage Services          
Disaggregation of Revenue [Line Items]          
Number of days in which payment is required     21 days    
Natural Gas Sales          
Disaggregation of Revenue [Line Items]          
Revenues from contracts with customers 931,976   $ 2,877,660    
Other sources of revenue, excluding gain (loss) on derivatives 0   0    
Total, excluding gain (loss) on derivatives 931,976   2,877,660    
NGLs Sales          
Disaggregation of Revenue [Line Items]          
Revenues from contracts with customers 106,621   357,746    
Other sources of revenue, excluding gain (loss) on derivatives 0   0    
Total, excluding gain (loss) on derivatives 106,621   357,746    
Oil Sales          
Disaggregation of Revenue [Line Items]          
Revenues from contracts with customers 8,392   29,322    
Other sources of revenue, excluding gain (loss) on derivatives 0   0    
Total, excluding gain (loss) on derivatives 8,392   $ 29,322    
Natural Gas, Oil, and NGLs Sales          
Disaggregation of Revenue [Line Items]          
Number of days in which payment is required     25 days    
Revenues from contracts with customers 1,046,989   $ 3,264,728    
Other sources of revenue, excluding gain (loss) on derivatives 0   0    
Total, excluding gain (loss) on derivatives 1,046,989   $ 3,264,728    
Water Services          
Disaggregation of Revenue [Line Items]          
Number of days in which payment is required     21 days    
Pipeline, Water and Net Marketing Services          
Disaggregation of Revenue [Line Items]          
Revenues from contracts with customers 111,429   $ 348,667    
Other sources of revenue, excluding gain (loss) on derivatives 3,527   28,109    
Total, excluding gain (loss) on derivatives 114,956   376,776    
Intersegment Eliminations          
Disaggregation of Revenue [Line Items]          
Revenues from contracts with customers (255,760)   (775,913)    
Other sources of revenue, excluding gain (loss) on derivatives 0   0    
Total, excluding gain (loss) on derivatives (255,760)   (775,913)    
(Loss) gain on derivatives not designated as hedges 0 0 0 0  
Total operating revenues (255,760) $ (144,598) (775,913) $ (418,337)  
EQT Production | Pipeline and Net Marketing Services          
Disaggregation of Revenue [Line Items]          
Revenues from contracts with customers 2,605   14,273    
Other sources of revenue, excluding gain (loss) on derivatives 3,527   28,109    
Total, excluding gain (loss) on derivatives 6,132   42,382    
EQM Gathering | Firm Reservation Fee Revenue          
Disaggregation of Revenue [Line Items]          
Revenues from contracts with customers 112,598   334,233    
Other sources of revenue, excluding gain (loss) on derivatives 0   0    
Total, excluding gain (loss) on derivatives 112,598   334,233    
EQM Gathering | Usage Fees Under Firm Contracts          
Disaggregation of Revenue [Line Items]          
Revenues from contracts with customers 8,661   30,725    
Other sources of revenue, excluding gain (loss) on derivatives 0   0    
Total, excluding gain (loss) on derivatives 8,661   30,725    
EQM Gathering | Usage Fees Under Interruptible Contract          
Disaggregation of Revenue [Line Items]          
Revenues from contracts with customers 131,602   366,482    
Other sources of revenue, excluding gain (loss) on derivatives 0   0    
Total, excluding gain (loss) on derivatives 131,602   366,482    
EQM Transmission | Firm Reservation Fee Revenue          
Disaggregation of Revenue [Line Items]          
Revenues from contracts with customers 82,669   262,666    
Other sources of revenue, excluding gain (loss) on derivatives 0   0    
Total, excluding gain (loss) on derivatives 82,669   262,666    
EQM Transmission | Usage Fees Under Firm Contracts          
Disaggregation of Revenue [Line Items]          
Revenues from contracts with customers 5,331   13,981    
Other sources of revenue, excluding gain (loss) on derivatives 0   0    
Total, excluding gain (loss) on derivatives 5,331   13,981    
EQM Transmission | Usage Fees Under Interruptible Contract          
Disaggregation of Revenue [Line Items]          
Revenues from contracts with customers 1,350   8,782    
Other sources of revenue, excluding gain (loss) on derivatives 0   0    
Total, excluding gain (loss) on derivatives 1,350   8,782    
EQM Water | Water Services          
Disaggregation of Revenue [Line Items]          
Revenues from contracts with customers 22,373   93,438    
Other sources of revenue, excluding gain (loss) on derivatives 0   0    
Total, excluding gain (loss) on derivatives $ 22,373   $ 93,438    
Minimum          
Disaggregation of Revenue [Line Items]          
Contract term         8 years
Maximum          
Disaggregation of Revenue [Line Items]          
Contract term         15 years