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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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