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Debt (Outstanding Borrowings) (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Total debt | $ 28,549 | $ 27,620
Unamortized debt issuance costs | (146) | (141)
Unamortized discount, net of unamortized premium | (183) | (196)
Amounts due within one year | (4,167) | (1,954)
Long-term debt | 24,053 | 25,329
Marathon Petroleum Corporation: |  |
Finance lease obligations | 494 | 464
Total debt | 6,193 | 6,914
Marathon Petroleum Corporation: | Senior notes |  |
Long-term debt, gross | 5,699 | 6,449
Marathon Petroleum Corporation: | Notes payable |  |
Long-term debt, gross | 0 | 1
MPLX LP: |  |
Finance lease obligations | 6 | 6
Total debt | 22,356 | 20,706
MPLX LP: | Senior notes |  |
Long-term debt, gross | $ 22,350 | $ 20,700

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