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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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