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Debt (Tables)
 12 Months Ended
Dec. 31, 2025
Debt Instrument [Line Items]  
Schedule of Debt [Table Text Block]
MPLX’s outstanding borrowings consist of the following:
 December 31,
(In millions)20252024
MPLX LP:
MPLX Credit Agreement$— $— 
4.000% senior notes due February 15, 2025
— 500 
4.875% senior notes due June 1, 2025
— 1,189 
1.750% senior notes due March 1, 2026
1,500 1,500 
4.125% senior notes due March 1, 2027
1,250 1,250 
4.250% senior notes due December 1, 2027
732 732 
4.000% senior notes due March 15, 2028
1,250 1,250 
4.800% senior notes due February 15, 2029
750 750 
2.650% senior notes due August 15, 2030
1,500 1,500 
4.800% senior notes due February 15, 2031
1,250 — 
4.950% senior notes due September 1, 2032
1,000 1,000 
5.000% senior notes due January 15, 2033
750 — 
5.000% senior notes due March 1, 2033
1,100 1,100 
5.500% senior notes due June 1, 2034
1,650 1,650 
5.400% senior notes due April 1, 2035
1,000 — 
5.400% senior notes due September 15, 2035
1,500 — 
4.500% senior notes due April 15, 2038
1,750 1,750 
5.200% senior notes due March 1, 2047
1,000 1,000 
5.200% senior notes due December 1, 2047
487 487 
4.700% senior notes due April 15, 2048
1,500 1,500 
5.500% senior notes due February 15, 2049
1,500 1,500 
4.950% senior notes due March 14, 2052
1,500 1,500 
5.650% senior notes due March 1, 2053
500 500 
5.950% senior notes due April 1, 2055
1,000 — 
6.200% senior notes due September 15, 2055
1,000 — 
4.900% senior notes due April 15, 2058
500 500 
Consolidated subsidiaries:
MarkWest - 4.875% senior notes, due 2025
— 11 
ANDX - 4.250% - 5.200% senior notes, due 2027-2047
31 31 
Finance lease obligations(1)
6 6 
Total26,006 21,206 
Unamortized debt issuance costs(174)(126)
Unamortized discount(179)(132)
Amounts due within one year(1,502)(1,693)
Total long-term debt due after one year$24,151 $19,255 
(1)    See Note 21 for lease information.
Schedule of Maturities of Long-Term Debt [Table Text Block]
The following table shows five years of scheduled debt payments, including payments on finance lease obligations, as of December 31, 2025:
(In millions) 
2026$1,503 
20272,002 
20281,250 
2029750 
20301,500 
Schedule of interest payable dates [Table Text Block]
Interest on each series of MPLX LP and ANDX senior notes outstanding is payable semi-annually in arrears, according to the table below.
Senior NotesInterest payable semi-annually in arrears
1.750% senior notes due March 1, 2026
March 1st and September 1st
4.125% senior notes due March 1, 2027
March 1st and September 1st
4.250% senior notes due December 1, 2027
June 1st and December 1st
4.000% senior notes due March 15, 2028
March 15th and September 15th
4.800% senior notes due February 15, 2029
February 15th and August 15th
2.650% senior notes due August 15, 2030
February 15th and August 15th
4.800% senior notes due February 15, 2031
February 15th and August 15th
4.950% senior notes due September 1, 2032
March 1st and September 1st
5.000% senior notes due January 15, 2033
January 15th and July 15th
5.000% senior notes due March 1, 2033
March 1st and September 1st
5.500% senior notes due June 1, 2034
June 1st and December 1st
5.400% senior notes due April 1, 2035
April 1st and October 1st
5.400% senior notes due September 15, 2035
March 15th and September 15th
4.500% senior notes due April 15, 2038
April 15th and October 15th
5.200% senior notes due March 1, 2047
March 1st and September 1st
5.200% senior notes due December 1, 2047
June 1st and December 1st
4.700% senior notes due April 15, 2048
April 15th and October 15th
5.500% senior notes due February 15, 2049
February 15th and August 15th
4.950% senior notes due March 14, 2052
March 14th and September 14th
5.650% senior notes due March 1, 2053
March 1st and September 1st
5.950% senior notes due April 1, 2055
April 1st and October 1st
6.200% senior notes due September 15, 2055
March 15th and September 15th
4.900% senior notes due April 15, 2058
April 15th and October 15th
Revolving Credit Facility  
Debt Instrument [Line Items]  
Schedule of Long-Term Debt Instruments
Activity on the MPLX Credit Agreement during the year ended December 31, 2025 is summarized in the table below. There were no revolver borrowings or repayments under the MPLX Credit Agreement during the year ended December 31, 2024.
(in millions, except %)2025
Borrowings$106 
Weighted average interest rate of borrowings7.74 %
Repayments$106 
Outstanding balance at end of period$— 
Letters of credit outstanding$0.2 
Total remaining availability on facility$2,000 
Percent of borrowing capacity available100 %
Senior Notes  
Debt Instrument [Line Items]  
Schedule of Long-Term Debt Instruments
The following table summarizes debt issuances during the year ended December 31, 2025, all of which were issued in an underwritten public offering:
Issue DateAggregate Principal Amount
(in millions)		NoteCoupon (percent)Price to Public
(percent of par)		Interest Payment DatesMaturity Date
March 10, 2025$1,000 
(1)
5.40099.398April 1 and October 1April 1, 2035
March 10, 20251,000 
(1)
5.95098.331April 1 and October 1April 1, 2055
August 11, 20251,250 
(2)
4.80099.880February 15 and August 15February 15, 2031
August 11, 2025750 
(2)
5.00098.936January 15 and July 15January 15, 2033
August 11, 20251,500 
(2)
5.40098.943March 15 and September 15September 15, 2035
August 11, 20251,000 
(2)
6.20098.277March 15 and September 15September 15, 2055
(1)    On April 9, 2025, MPLX used $1.2 billion of the net proceeds from the issuance of senior notes in March 2025 to redeem all of (i) MPLX’s outstanding $1,189 million aggregate principal amount of 4.875 percent senior notes due June 2025 and (ii) MarkWest’s outstanding $11 million aggregate principal amount of 4.875 percent senior notes due June 2025. The remaining net proceeds from this offering were used for general partnership purposes.
(2)    We used a portion of the net proceeds from this offering to fund the Northwind Midstream Acquisition, including the payment of related fees and expenses, and to increase cash and cash equivalents following the recently completed BANGL Acquisition and BANGL Debt Repayment. The remainder of the net proceeds from this offering were used for general partnership purposes.