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Revolving Credit Facilities	9 Months Ended
Revolving Credit Facilities	Sep. 30, 2016
Short-term Debt [Abstract]
Revolving Credit Facilities	Revolving Credit Facilities The Company has a $1.5 billion unsecured revolving credit facility that expires in February 2019. The Company had no borrowings or letters of credit outstanding under its revolving credit facility as of September 30, 2016 or December 31, 2015 or at any time during the three and nine months ended September 30, 2016 and 2015. EQM has a $750 million credit facility that expires in February 2019, and EQM had $91 million of borrowings and no letters of credit outstanding under its revolving credit facility as of September 30, 2016. As of December 31, 2015, EQM had $299 million of borrowings and no letters of credit outstanding under its revolving credit facility. The maximum amount of outstanding borrowings under EQM’s revolving credit facility at any time during the three and nine months ended September 30, 2016 was $91 million and $299 million, respectively. The maximum amount of outstanding borrowings under EQM’s revolving credit facility at any time during the three and nine months ended September 30, 2015 was $404 million for both periods. The average daily balance of loans outstanding under EQM’s credit facility was approximately $34 million and $67 million at a weighted average annual interest rate of 2.0% and 1.9% for the three and nine months ended September 30, 2016, respectively. The average daily balance of loans outstanding under EQM’s credit facility was approximately $357 million and $241 million during the three and nine months ended September 30, 2015, respectively, at a weighted average annual interest rate of 1.7% for both periods. The Company incurred commitment fees averaging approximately 6 basis points for each of the three months ended September 30, 2016 and 2015, and 17 basis points for each of the nine months ended September 30, 2016 and 2015, to maintain credit availability under its revolving credit facility. EQM incurred commitment fees averaging approximately 6 basis points for each of the three months ended September 30, 2016 and 2015, and 17 basis points for each of the nine months ended September 30, 2016 and 2015, to maintain credit availability under its revolving credit facility.