Revolving Credit Facilities	9 Months Ended
Sep. 30, 2017
Short-term Debt [Abstract]
Revolving Credit Facilities	Revolving Credit Facilities In July 2017, the Company amended and restated its $1.5 billion revolving credit facility to extend the term to July 2022. In addition, following the closing of the Rice Merger (defined in Note N) and subject to the satisfaction of certain conditions, the borrowing capacity under the revolving credit facility will automatically increase to $2.5 billion. The Company had no borrowings or letters of credit outstanding under its revolving credit facility as of September 30, 2017 or December 31, 2016 or at any time during the three and nine months ended September 30, 2017 and 2016. In July 2017, EQM amended and restated its credit facility to increase the borrowing capacity under the facility from $750 million to $1 billion and to extend the term to July 2022. Subject to certain terms and conditions, the $1 billion credit facility has an accordion feature that allows EQM to increase the available borrowings under the facility by up to an additional $500 million. EQM had $105 million in borrowings and no letters of credit outstanding under the credit facility as of September 30, 2017. EQM had no borrowings and no letters of credit outstanding under the credit facility as of December 31, 2016. The maximum amount of outstanding borrowings under EQM’s revolving credit facility at any time during each of the three and nine months ended September 30, 2017 was $177 million. The maximum amount of EQM's outstanding borrowings under the credit facility at any time during the three and nine months ended September 30, 2016 was $91 million and $299 million, respectively. The average daily balance of loans outstanding under EQM's credit facility was approximately $95 million and $32 million during the three and nine months ended September 30, 2017, respectively, at a weighted average annual interest rate of 2.7% for both periods. The average daily balance of loans outstanding under EQM's credit facility was approximately $34 million and $67 million at weighted average annual interest rates of 2.0% and 1.9% for the three and nine months ended September 30, 2016, respectively.

Revolving Credit Facilities

In July 2017, the Company amended and restated its $1.5 billion revolving credit facility to extend the term to July 2022. In addition, following the closing of the Rice Merger (defined in Note N) and subject to the satisfaction of certain conditions, the borrowing capacity under the revolving credit facility will automatically increase to $2.5 billion. The Company had no borrowings or letters of credit outstanding under its revolving credit facility as of September 30, 2017 or December 31, 2016 or at any time during the three and nine months ended September 30, 2017 and 2016.

In July 2017, EQM amended and restated its credit facility to increase the borrowing capacity under the facility from $750 million to $1 billion and to extend the term to July 2022. Subject to certain terms and conditions, the $1 billion credit facility has an accordion feature that allows EQM to increase the available borrowings under the facility by up to an additional $500 million. EQM had $105 million in borrowings and no letters of credit outstanding under the credit facility as of September 30, 2017. EQM had no borrowings and no letters of credit outstanding under the credit facility as of December 31, 2016. The maximum amount of outstanding borrowings under EQM’s revolving credit facility at any time during each of the three and nine months ended September 30, 2017 was $177 million. The maximum amount of EQM's outstanding borrowings under the credit facility at any time during the three and nine months ended September 30, 2016 was $91 million and $299 million, respectively. The average daily balance of loans outstanding under EQM's credit facility was approximately $95 million and $32 million during the three and nine months ended September 30, 2017, respectively, at a weighted average annual interest rate of 2.7% for both periods. The average daily balance of loans outstanding under EQM's credit facility was approximately $34 million and $67 million at weighted average annual interest rates of 2.0% and 1.9% for the three and nine months ended September 30, 2016, respectively.