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Revolving Credit Facilities (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
EQM          
Line of Credit Facility          
Line of credit facility, maximum borrowing capacity $ 750,000,000   $ 750,000,000    
Revolving credit facility          
Line of Credit Facility          
Line of credit facility, maximum borrowing capacity 1,500,000,000.0   1,500,000,000.0    
Amount of borrowings 0   0   $ 0
Letters of credit outstanding under revolving credit facility 0   0   0
Maximum amount of outstanding short-term loans at any time during the period 0 $ 0 0 $ 0  
Revolving credit facility | EQM          
Line of Credit Facility          
Amount of borrowings 0   0   0
Letters of credit outstanding under revolving credit facility 0   0   $ 0
Maximum amount of outstanding short-term loans at any time during the period $ 0 128,000,000 $ 0 299,000,000  
Average daily balance of short-term loans outstanding during the period   $ 33,000,000   $ 83,000,000  
Weighted average interest rates of average daily balance of short-term loans   1.90%   1.90%