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Debt - Outstanding Borrowings (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Total debt |  | $ 29,294 | $ 27,980
Unamortized debt issuance costs |  | (137) | (128)
Unamortized discount |  | (318) | (328)
Amounts due within one year |  | (557) | (544)
Total long-term debt due after one year |  | 28,282 | 26,980
Marathon Petroleum Corporation |  |  |
Total debt |  | 9,174 | 9,114
MPLX LP |  |  |
Total debt |  | 20,120 | 13,856
ANDX |  |  |
Total debt | [1] | $ 0 | 5,010
Capital lease obligations |  |  | 15
ANDX | Senior notes |  |  |
Long-term debt, gross |  |  | 3,750
ANDX | ANDX revolver |  |  |
Long-term debt, gross |  |  | $ 1,245
[1] | On July 30, 2019, MPLX acquired ANDX and assumed its debt obligations. See Note 3 and the discussion below for additional information. The ANDX December 31, 2018 balance includes senior notes of $3,750 million, borrowings under the revolving and dropdown credit facilities of $1,245 million and capital leases of $15 million.

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