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Debt (Outstanding Borrowings) (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Total debt	$ 27,178	$ 25,948
Unamortized debt issuance costs	(140)	(129)
Unamortized (discount) premium, net	(264)	(280)
Amounts due within one year	(1,087)	(571)
Total long-term debt due after one year	25,687	24,968
Marathon Petroleum Corporation:
Finance lease obligations	620	589
Total debt	7,070	7,039
Marathon Petroleum Corporation: | Senior notes
Long-term debt, gross	6,449	6,449
Marathon Petroleum Corporation: | Notes payable
Long-term debt, gross	1	1
MPLX LP:
Finance lease obligations	8	9
Total debt	20,108	18,909
MPLX LP: | Bank revolving credit facility
Long-term debt, gross	0	300
MPLX LP: | Senior notes
Long-term debt, gross	$ 20,100	$ 18,600

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