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Debt (Outstanding Borrowings) (Detail) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Total debt	$ 29,014	$ 27,797
Unamortized debt issuance costs	(171)	(142)
Unamortized discount, net of unamortized premium	(189)	(174)
Amounts due within one year	(1,819)	(3,049)
Long-term debt	26,835	24,432
MPC:
Commercial paper	210	0
Finance lease obligations	680	718
Total debt	7,507	6,591
MPC: | Senior notes
Long-term debt, gross	6,449	5,699
MPC: | Bonds
Other long-term debt	168	174
MPLX:
Finance lease obligations	7	6
Total debt	21,507	21,206
MPLX: | Senior notes
Long-term debt, gross	$ 21,500	$ 21,200

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Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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