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Debt (Summary of Outstanding Borrowings) (Details) - USD ($)
$ in Millions
 12 Months Ended
Aug. 11, 2025
Mar. 10, 2025
Dec. 31, 2025
Apr. 09, 2025
Feb. 18, 2025
Dec. 31, 2024
Dec. 01, 2024
May 20, 2024
Debt Instrument [Line Items]                
Finance Lease, Liability [1]     $ 6     $ 6    
Debt and capital lease obligations     26,006     21,206    
Unamortized debt issuance costs     174     126    
Unamortized discount     179     132    
Debt, Current     1,502     1,693    
Total long-term debt due after one year     24,151     19,255    
MPLX Revolving Credit Facility due July 2027                
Debt Instrument [Line Items]                
Outstanding balance     0          
MPLX Revolving Credit Facility due July 2024 [Member]                
Debt Instrument [Line Items]                
Outstanding balance           0    
Senior Notes                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount $ 4,500              
Senior Notes | Senior Note Due June 2034                
Debt Instrument [Line Items]                
Interest Rate               5.50%
Debt Instrument, Face Amount               $ 1,650
Senior Notes | Senior Notes Due February 2031                
Debt Instrument [Line Items]                
Interest Rate 4.80%              
Maturity Date Feb. 15, 2031              
Debt Instrument, Face Amount [2] $ 1,250              
Senior Notes | Senior Notes Due January 2033                
Debt Instrument [Line Items]                
Interest Rate 5.00%              
Maturity Date Jan. 15, 2033              
Debt Instrument, Face Amount [2] $ 750              
Senior Notes | Senior Notes Due April 2035                
Debt Instrument [Line Items]                
Interest Rate   5.40%            
Maturity Date   Apr. 01, 2035            
Debt Instrument, Face Amount [3]   $ 1,000            
Senior Notes | Senior Notes Due September 2035                
Debt Instrument [Line Items]                
Interest Rate 5.40%              
Maturity Date Sep. 15, 2035              
Debt Instrument, Face Amount [2] $ 1,500              
Senior Notes | Senior Notes Due April 2055                
Debt Instrument [Line Items]                
Interest Rate   5.95%            
Maturity Date   Apr. 01, 2055            
Debt Instrument, Face Amount [3]   $ 1,000            
Senior Notes | Senior Notes Due September 2055                
Debt Instrument [Line Items]                
Interest Rate 6.20%              
Maturity Date Sep. 15, 2055              
Debt Instrument, Face Amount [2] $ 1,000              
MPLX LP | Senior Notes | Senior Notes Due December 2024 [Member]                
Debt Instrument [Line Items]                
Interest Rate             4.875%  
MPLX LP | Senior Notes | Senior Notes Due February 2025 [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 0     500    
Interest Rate     4.00%   4.00%      
Maturity Date     Feb. 15, 2025          
MPLX LP | Senior Notes | Senior Notes Due June 2025 [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 0     1,189    
Interest Rate     4.875% 4.875%        
Maturity Date     Jun. 01, 2025          
MPLX LP | Senior Notes | Senior Notes Due March 2026 [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,500     1,500    
Interest Rate     1.75%          
Maturity Date     Mar. 01, 2026          
MPLX LP | Senior Notes | 4.125% senior notes due March 2027                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,250     1,250    
Interest Rate     4.125%          
Maturity Date     Mar. 01, 2027          
MPLX LP | Senior Notes | Senior Notes Due December 2027 [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 732     732    
Interest Rate     4.25%          
Maturity Date     Dec. 01, 2027          
MPLX LP | Senior Notes | Senior Notes Due March 2028 [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,250     1,250    
Interest Rate     4.00%          
Maturity Date     Mar. 15, 2028          
MPLX LP | Senior Notes | Senior Notes Due February 2029 [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 750     750    
Interest Rate     4.80%          
Maturity Date     Feb. 15, 2029          
MPLX LP | Senior Notes | Senior Notes Due August 2030 [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,500     1,500    
Interest Rate     2.65%          
Maturity Date     Aug. 15, 2030          
MPLX LP | Senior Notes | Senior Note Due September 2032                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,000     1,000    
Interest Rate     4.95%          
Maturity Date     Sep. 01, 2032          
MPLX LP | Senior Notes | Senior Note Due March 2033                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,100     1,100    
Interest Rate     5.00%          
Maturity Date     Mar. 01, 2033          
MPLX LP | Senior Notes | Senior Note Due June 2034                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,650     1,650    
Interest Rate     5.50%          
Maturity Date     Jun. 01, 2034          
MPLX LP | Senior Notes | Senior Notes Due April 2038 [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,750     1,750    
Interest Rate     4.50%          
Maturity Date     Apr. 15, 2038          
MPLX LP | Senior Notes | 5.200% senior notes due March 2047                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,000     1,000    
Interest Rate     5.20%          
Maturity Date     Mar. 01, 2047          
MPLX LP | Senior Notes | Senior Notes Due December 2047 [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 487     487    
Interest Rate     5.20%          
Maturity Date     Dec. 01, 2047          
MPLX LP | Senior Notes | Senior Notes Due April 2048 [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,500     1,500    
Interest Rate     4.70%          
Maturity Date     Apr. 15, 2048          
MPLX LP | Senior Notes | Senior Notes Due February 2049 [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,500     1,500    
Interest Rate     5.50%          
Maturity Date     Feb. 15, 2049          
MPLX LP | Senior Notes | Senior Note Due March 2052 [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,500     1,500    
Interest Rate     4.95%          
Maturity Date     Mar. 14, 2052          
MPLX LP | Senior Notes | Senior Note Due March 2053                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 500     500    
Interest Rate     5.65%          
Maturity Date     Mar. 01, 2053          
MPLX LP | Senior Notes | Senior Notes Due April 2058 [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 500     500    
Interest Rate     4.90%          
Maturity Date     Apr. 15, 2058          
MPLX LP | Senior Notes | Senior Notes Due February 2031                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,250     0    
Interest Rate     4.80%          
Maturity Date     Feb. 15, 2031          
MPLX LP | Senior Notes | Senior Notes Due January 2033                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 750     0    
Interest Rate     5.00%          
Maturity Date     Jan. 15, 2033          
MPLX LP | Senior Notes | Senior Notes Due April 2035                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,000     0    
Interest Rate     5.40%          
Maturity Date     Apr. 01, 2035          
MPLX LP | Senior Notes | Senior Notes Due September 2035                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,500     0    
Interest Rate     5.40%          
Maturity Date     Sep. 15, 2035          
MPLX LP | Senior Notes | Senior Notes Due April 2055                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,000     0    
Interest Rate     5.95%          
Maturity Date     Apr. 01, 2055          
MPLX LP | Senior Notes | Senior Notes Due September 2055                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 1,000     0    
Interest Rate     6.20%          
Maturity Date     Sep. 15, 2055          
MarkWest | Senior Notes                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 0     11    
Interest Rate     4.875%          
MarkWest | Senior Notes | Senior Notes Due December 2024 [Member]                
Debt Instrument [Line Items]                
Interest Rate             4.875%  
MarkWest | Senior Notes | Senior Notes Due June 2025 [Member]                
Debt Instrument [Line Items]                
Interest Rate       4.875%        
ANDX LP [Member] | Senior Notes                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 31     $ 31    
ANDX LP [Member] | Senior Notes | Minimum                
Debt Instrument [Line Items]                
Interest Rate     4.25%          
ANDX LP [Member] | Senior Notes | Maximum                
Debt Instrument [Line Items]                
Interest Rate     5.20%          
[1] See Note 21 for lease information.
[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.
[3] 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.