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v3.25.4

Debt (Summary of Outstanding Borrowings Interest Rates and Table Due Dates) (Details) - Senior Notes | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2025 | Apr. 09, 2025 | Feb. 18, 2025 | May 20, 2024
Senior Note Due June 2034 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  |  |  | 5.50%
MPLX LP | Senior Notes Due February 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.00% |  | 4.00% |
Debt Instrument, Maturity Date | Feb. 15, 2025 |  |  |
MPLX LP | Senior Notes Due June 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.875% | 4.875% |  |
Debt Instrument, Maturity Date | Jun. 01, 2025 |  |  |
MPLX LP | Senior Notes Due March 2026 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 1.75% |  |  |
Debt Instrument, Maturity Date | Mar. 01, 2026 |  |  |
MPLX LP | Senior Notes Due March 2027 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.125% |  |  |
Debt Instrument, Maturity Date | Mar. 01, 2027 |  |  |
MPLX LP | Senior Notes Due December 2027 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.25% |  |  |
Debt Instrument, Maturity Date | Dec. 01, 2027 |  |  |
MPLX LP | Senior Notes Due March 2028 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.00% |  |  |
Debt Instrument, Maturity Date | Mar. 15, 2028 |  |  |
MPLX LP | Senior Notes Due February 2029 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.80% |  |  |
Debt Instrument, Maturity Date | Feb. 15, 2029 |  |  |
MPLX LP | Senior Notes Due August 2030 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 2.65% |  |  |
Debt Instrument, Maturity Date | Aug. 15, 2030 |  |  |
MPLX LP | Senior Note Due September 2032 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.95% |  |  |
Debt Instrument, Maturity Date | Sep. 01, 2032 |  |  |
MPLX LP | Senior Note Due March 2033 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.00% |  |  |
Debt Instrument, Maturity Date | Mar. 01, 2033 |  |  |
MPLX LP | Senior Note Due June 2034 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.50% |  |  |
Debt Instrument, Maturity Date | Jun. 01, 2034 |  |  |
MPLX LP | Senior Notes Due April 2038 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.50% |  |  |
Debt Instrument, Maturity Date | Apr. 15, 2038 |  |  |
MPLX LP | 5.200% senior notes due March 2047 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.20% |  |  |
Debt Instrument, Maturity Date | Mar. 01, 2047 |  |  |
MPLX LP | Senior Notes Due December 2047 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.20% |  |  |
Debt Instrument, Maturity Date | Dec. 01, 2047 |  |  |
MPLX LP | Senior Notes Due April 2048 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.70% |  |  |
Debt Instrument, Maturity Date | Apr. 15, 2048 |  |  |
MPLX LP | Senior Notes Due November 2049 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.50% |  |  |
Debt Instrument, Maturity Date | Feb. 15, 2049 |  |  |
MPLX LP | Senior Note Due March 2052 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.95% |  |  |
Debt Instrument, Maturity Date | Mar. 14, 2052 |  |  |
MPLX LP | Senior Note Due March 2053 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.65% |  |  |
Debt Instrument, Maturity Date | Mar. 01, 2053 |  |  |
MPLX LP | Senior Notes Due April 2058 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.90% |  |  |
Debt Instrument, Maturity Date | Apr. 15, 2058 |  |  |

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