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Revolving Credit Facilities (Details) - USD ($) |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 23, 2018 | Jul. 23, 2018 | Jun. 25, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jul. 23, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2018 | Apr. 25, 2018 | Dec. 31, 2017
Revolving credit facility | EQM |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 1,000,000,000 |  |  | $ 1,000,000,000 |  |  |  |
Amount of borrowings |  |  |  | 22,000,000 |  |  | 22,000,000 |  |  |  | $ 180,000,000
Letters of credit outstanding under revolving credit facility |  |  |  | 1,000,000 |  |  | 1,000,000 |  |  |  | 0
Maximum amount of outstanding short-term loans at any time during the period |  |  |  | 74,000,000 | $ 177,000,000 |  | 420,000,000 | $ 177,000,000 |  |  |
Average daily balance of short-term loans outstanding during the period |  |  |  | $ 22,000,000 | $ 95,000,000 |  | $ 147,000,000 | $ 32,000,000 |  |  |
Weighted average interest rates of average daily balance of short-term loans |  |  |  | 3.70% | 2.70% |  | 3.20% | 2.70% |  |  |
Repayments of lines of credit | $ 260,000,000 |  |  |  |  |  |  |  |  |  |
Revolving credit facility | EQM | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 3,000,000,000 |  |
Revolving credit facility | EQT 2.5 Billion Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 2,500,000,000.0 |  |  | $ 2,500,000,000.0 |  |  |  |
Amount of borrowings |  |  |  | 500,000,000 | $ 0 |  | 500,000,000 | $ 0 |  |  | 1,300,000,000
Letters of credit outstanding under revolving credit facility |  |  |  | 0 | 0 |  | 0 | 0 |  |  | 159,400,000
Maximum amount of outstanding short-term loans at any time during the period |  |  |  | 700,000,000 | $ 0 |  | 1,600,000,000 | $ 0 |  |  |
Average daily balance of short-term loans outstanding during the period |  |  |  | $ 300,000,000 |  |  | $ 900,000,000 |  |  |  |
Weighted average interest rates of average daily balance of short-term loans |  |  |  | 3.60% |  |  | 3.30% |  |  |  |
Revolving credit facility | RMP $850 Million Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Amount of borrowings |  |  |  |  |  |  |  |  |  |  | 286,000,000
Letters of credit outstanding under revolving credit facility |  |  |  |  |  |  |  |  |  |  | $ 1,000,000
Maximum amount of outstanding short-term loans at any time during the period |  | $ 260,000,000 |  |  |  | $ 375,000,000 |  |  |  |  |
Average daily balance of short-term loans outstanding during the period |  |  |  | $ 249,000,000 |  |  | $ 300,000,000 |  |  |  |
Weighted average interest rates of average daily balance of short-term loans |  |  |  | 4.10% |  |  | 3.80% |  |  |  |
EQM Term Loan Facility | EQM |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 2,500,000,000.0 |
Maximum amount of outstanding short-term loans at any time during the period |  |  | $ 1,825,000,000 |  |  |  |  |  |  |  |
Average daily balance of short-term loans outstanding during the period |  |  | $ 1,231,000,000 |  |  |  |  |  |  |  |
Write off of deferred debt issuance cost |  |  |  |  |  |  | $ 3,000,000 |  |  |  |
Weighted average interest rate |  |  | 3.30% |  |  |  |  |  |  |  |

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum amount borrowed under the credit facility at any time during the period. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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