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Financial Information by Business Segment - Schedule of Revenue from External Customers and Operating Income (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Nov. 12, 2017
segment
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2018
segment
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Operating segments information            
Number of reportable segments | segment 3     5 4  
Revenues:            
Sales of natural gas, oil and NGLs   $ 1,158,418     $ 3,613,395  
(Loss) gain on derivatives not designated as hedges   (3,075) $ 35,625   5,620 $ 222,693
Total operating revenues   1,158,870 659,413   3,647,124 2,242,324
Reconciliation of operating (loss) income to net (loss) income:            
Total operating income (loss)   71,824 138,027   (1,551,723) 719,130
Other income   21,755 6,526   43,092 15,880
Interest expense   93,042 50,377   240,059 137,110
Income tax (benefit) expense   (62,911) (11,281)   (503,505) 119,093
Net income (loss)   63,448 105,457   (1,245,185) 478,807
Transaction costs   31,506 10,806   93,176 15,044
Sales of natural gas, oil and NGLs            
Revenues:            
Sales of natural gas, oil and NGLs   1,046,989 552,953   3,264,728 1,803,132
Pipeline, water and net marketing services            
Revenues:            
Pipeline, water and net marketing services   114,956 70,835   376,776 216,499
EQT Production            
Reconciliation of operating (loss) income to net (loss) income:            
Impairment of long-lived assets   300,000     2,700,000  
Operating Segments | EQT Production            
Revenues:            
(Loss) gain on derivatives not designated as hedges   (3,075) 35,625   5,620 222,693
Total operating revenues   1,050,046 597,718   3,312,730 2,057,481
Reconciliation of operating (loss) income to net (loss) income:            
Total operating income (loss)   (121,678) 12,201   (2,127,323) 322,634
Operating Segments | EQT Production | Sales of natural gas, oil and NGLs            
Revenues:            
Sales of natural gas, oil and NGLs   1,046,989 552,953   3,264,728 1,803,132
Operating Segments | EQT Production | Pipeline, water and net marketing services            
Revenues:            
Pipeline, water and net marketing services   6,132 9,140   42,382 31,656
Operating Segments | EQM Gathering            
Revenues:            
(Loss) gain on derivatives not designated as hedges   0 0   0 0
Total operating revenues   252,861 116,522   731,440 330,996
Reconciliation of operating (loss) income to net (loss) income:            
Total operating income (loss)   177,902 85,932   510,755 243,061
Operating Segments | EQM Gathering | Sales of natural gas, oil and NGLs            
Revenues:            
Sales of natural gas, oil and NGLs   0 0   0 0
Operating Segments | EQM Gathering | Pipeline, water and net marketing services            
Revenues:            
Pipeline, water and net marketing services   252,861 116,522   731,440 330,996
Operating Segments | EQM Transmission            
Revenues:            
(Loss) gain on derivatives not designated as hedges   0 0   0 0
Total operating revenues   89,350 89,771   285,429 272,184
Reconciliation of operating (loss) income to net (loss) income:            
Total operating income (loss)   58,691 59,770   198,784 189,237
Operating Segments | EQM Transmission | Sales of natural gas, oil and NGLs            
Revenues:            
Sales of natural gas, oil and NGLs   0 0   0 0
Operating Segments | EQM Transmission | Pipeline, water and net marketing services            
Revenues:            
Pipeline, water and net marketing services   89,350 89,771   285,429 272,184
Operating Segments | EQM Water            
Revenues:            
(Loss) gain on derivatives not designated as hedges   0     0  
Total operating revenues   22,373     93,438  
Reconciliation of operating (loss) income to net (loss) income:            
Total operating income (loss)   (3,093) 0   35,627 0
Operating Segments | EQM Water | Sales of natural gas, oil and NGLs            
Revenues:            
Sales of natural gas, oil and NGLs   0     0  
Operating Segments | EQM Water | Pipeline, water and net marketing services            
Revenues:            
Pipeline, water and net marketing services   22,373     93,438  
Intersegment Eliminations            
Revenues:            
Sales of natural gas, oil and NGLs   (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)
Reconciliation of operating (loss) income to net (loss) income:            
Income (loss) included in development costs   3,200     50,700  
Intersegment Eliminations | Sales of natural gas, oil and NGLs            
Revenues:            
Sales of natural gas, oil and NGLs   0 0   0 0
Intersegment Eliminations | Pipeline, water and net marketing services            
Revenues:            
Pipeline, water and net marketing services   (255,760) (144,598)   (775,913) (418,337)
Unallocated Expenses and Intersegment Eliminations            
Reconciliation of operating (loss) income to net (loss) income:            
Total operating income (loss)   (39,998) $ (19,876)   (169,566) $ (35,802)
Corporate, Non-Segment            
Reconciliation of operating (loss) income to net (loss) income:            
Transaction costs   29,300     85,700  
Amortization   $ 10,400     $ 31,000