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Debt | 6 Months Ended
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Jun. 30, 2017
Debt Disclosure [Abstract] |
Debt | Debt The Partnership’s outstanding borrowings consisted of the following:
(In millions) | June 30, 2017 |  | December 31, 2016
MPLX LP: |  |  |
Bank revolving credit facility due 2020 | $ | — |  |  | $ | — |
Term loan facility due 2019 | 250 |  |  | 250 |
5.500% senior notes due February 2023 | 710 |  |  | 710 |
4.500% senior notes due July 2023 | 989 |  |  | 989 |
4.875% senior notes due December 2024 | 1,149 |  |  | 1,149 |
4.000% senior notes due February 2025 | 500 |  |  | 500 |
4.875% senior notes due June 2025 | 1,189 |  |  | 1,189 |
4.125% senior notes due March 2027 | 1,250 |  |  | — |
5.200% senior notes due March 2047 | 1,000 |  |  | — |
Consolidated subsidiaries: |  |  |
MarkWest - 4.500% - 5.500% senior notes, due 2023-2025 | 63 |  |  | 63 |
MPL - capital lease obligations due 2020 | 8 |  |  | 8 |
Total | 7,108 |  |  | 4,858 |
Unamortized debt issuance costs | (28 | ) |  | (7 | )
Unamortized discount | (413 | ) |  | (428 | )
Amounts due within one year | (1 | ) |  | (1 | )
Total long-term debt due after one year | $ | 6,666 |  |  | $ | 4,422 |
Credit Agreements During the six months ended June 30, 2017, the Partnership had no borrowings under the bank revolving credit facility. At June 30, 2017, the Partnership had no outstanding borrowings and $3 million letters of credit outstanding under this facility, resulting in total availability of $2.0 billion, or 99.9 percent of the borrowing capacity. The $250 million term loan facility was drawn in full on November 20, 2014. The borrowings under this facility during the six months ended June 30, 2017 were at an average interest rate of 2.377 percent. Senior Notes On February 10, 2017, the Partnership completed a public offering of $2.25 billion aggregate principal amount of unsecured senior notes, consisting of (i) $1.25 billion aggregate principal amount of 4.125 percent senior notes due in March 2027 and (ii) $1.0 billion aggregate principal amount of 5.200 percent senior notes due in March 2047 (collectively, the “New Senior Notes”). The net proceeds from the New Senior Notes totaled approximately $2.22 billion, after deducting underwriting discounts, and were used for general partnership purposes and capital expenditures. Interest on each series of the notes is payable semi-annually in arrears on March 1 and September 1, commencing on September 1, 2017.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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