v3.19.2

Debt (Notes) | 6 Months Ended
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Jun. 30, 2019
Debt Disclosure [Abstract] |
Debt | Debt Debt Balance, Net of Unamortized Issuance Costs (in millions)
| June 30, 2019 |  | December 31, 2018
Total debt | $ | 5,263 |  |  | $ | 5,010 |
Unamortized issuance costs | (40 | ) |  | (46 | )
Current maturities | (503 | ) |  | (504 | )
Debt, Net of Current Maturities and Unamortized Issuance Costs | $ | 4,720 |  |  | $ | 4,460 |
Our debt is non-recourse to Marathon, except for TLGP and, with respect to borrowings under our Dropdown Credit Facility, WR Southwest. Available Capacity Under Credit Facilities (in millions) (a)
| Total Capacity |  | Amount Borrowed as of June 30, 2019 |  | Outstanding Letters of Credit |  | Available Capacity as of June 30, 2019 |  | Weighted Average Interest Rate |  | Expiration
Revolving Credit Facility | $ | 1,100 |  |  | $ | 1,070 |  |  | $ | — |  |  | $ | 30 |  |  | 3.90 | % |  | January 29, 2021
Dropdown Credit Facility | 1,000 |  |  | 430 |  |  | — |  |  | 570 |  |  | 3.92 | % |  | January 29, 2021
MPC Loan Agreement | 500 |  |  | — |  |  | — |  |  | 500 |  |  | — | % |  | December 21, 2023
Total Credit Facilities | $ | 2,600 |  |  | $ | 1,500 |  |  | $ | — |  |  | $ | 1,100 |  |  |  |  |
(a) In conjunction with the MPLX Merger, on July 30, 2019, all outstanding borrowings and unpaid fees on our credit facilities were repaid and the agreements were terminated, including the MPC Loan Agreement.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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