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Pay vs Performance Disclosure
 4 Months Ended 12 Months Ended
Apr. 29, 2020
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Pay vs Performance Disclosure [Table]        
Pay vs Performance [Table Text Block]  
Pay Versus Performance
SEC rules require us to disclose the following information concerning executive compensation and certain financial performance information about the Company for the periods shown.
PAY VERSUS PERFORMANCE TABLE
Value of Initial Fixed $100 Investment Based On:
Year
Summary Compensation Table Total for PEO
($)
Compensation Actually Paid to PEO
($)
Average Summary Compensation Table Total for Non-PEO NEOs
($)
Average Compensation Actually Paid to Non-PEO NEOs
($)
Net Income
($ millions)
MPC Relative TSR Performance Percentile
Total Shareholder Return
($)
Peer Group Total Shareholder Return
($)
202221,288,53257,863,2174,759,89911,688,458218.21 153.61 16,05083.33rd
202121,185,20631,076,7415,601,2035,934,676116.95 90.02 11,00191.67th
202015,534,26521,219,0145,628,2575,101,56272.64 66.82 (9,977)90.00th
10,005,70010,070,251
    
Company Selected Measure Name   MPC Relative TSR Performance Percentile    
Named Executive Officers, Footnote [Text Block]  
•2022: Maryann T. Mannen, Suzanne Gagle, Timothy J. Aydt, Gregory S. Floerke and Raymond L. Brooks.
•2021: Maryann T. Mannen, Raymond L. Brooks, Suzanne Gagle, Brian C. Davis, Donald C. Templin and Timothy T. Griffith.
•2020: Donald C. Templin, Timothy T. Griffith, Raymond L. Brooks and Suzanne Gagle.
    
Peer Group Issuers, Footnote [Text Block]   Peer Group Total Shareholder Return is shown for the S&P 500 Oil & Gas Refining & Marketing Sub-Industry Index, which is the same peer group used for the Stock Return Performance Graph included in our 2022 Annual Report.    
PEO Total Compensation Amount $ 10,005,700 $ 21,288,532 $ 21,185,206 $ 15,534,265
PEO Actually Paid Compensation Amount 10,070,251 $ 57,863,217 31,076,741 21,219,014
Adjustment To PEO Compensation, Footnote [Text Block]  
PEO SCT TOTAL TO CAP TOTAL RECONCILIATION
Additions to SCT Total
Year
SCT Total
($)
Deductions
from SCT Total
($)
Pension
Service Cost
($)
Change in Value of Equity Awards as Summarized Below
($)
CAP Total
($)
202221,288,53214,521,516374,53150,721,67057,863,217
202121,185,20614,636,291292,77224,235,05431,076,741
2020*15,534,26510,532,443234,23515,982,95721,219,014
10,005,7006,000,009—6,064,56010,070,251
* Includes Mr. Hennigan (top row) and Mr. Heminger (bottom row).
    
Non-PEO NEO Average Total Compensation Amount   $ 4,759,899 5,601,203 5,628,257
Non-PEO NEO Average Compensation Actually Paid Amount   $ 11,688,458 5,934,676 5,101,562
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]  
NON-PEO NEO (AVERAGE) SCT TOTAL TO CAP TOTAL RECONCILIATION
Additions to SCT Total
Year
SCT Total
($)
Deductions
from SCT Total
($)
Pension
Service Cost
($)
Change in Value of Equity Awards as Summarized Below
($)
CAP Total
($)
20224,759,8992,890,90194,2469,725,21411,688,458
20215,601,2034,130,39999,2994,364,5735,934,676
20205,628,2573,309,326164,8552,617,7765,101,562
    
Equity Valuation Assumption Difference, Footnote [Text Block]   Additions to SCT Total reflect the value of equity calculated in accordance with SEC methodology for determining CAP for each year shown. While stock options at grant were determined using a Black-Scholes valuation, the valuation of stock options at either year-end or vesting date was determined using a lattice model. The equity component of CAP for 2022 is further detailed in the supplemental table below.    
Compensation Actually Paid vs. Total Shareholder Return [Text Block]   mpc-20230301_g81.jpg    
Compensation Actually Paid vs. Net Income [Text Block]   mpc-20230301_g82.jpg    
Compensation Actually Paid vs. Company Selected Measure [Text Block]   mpc-20230301_g83.jpg    
Total Shareholder Return Vs Peer Group [Text Block]   mpc-20230301_g80.jpg    
Tabular List [Table Text Block]  
FINANCIAL PERFORMANCE MEASURES USED TO LINK EXECUTIVE COMPENSATION TO MPC PERFORMANCE
MPC Relative TSR Performance Percentile
MPC TSR
MPLX Total Unitholder Return*
MPC Adjusted EBITDA
* This measure is calculated pursuant to SEC Regulation S-K, Item 402(v)(2)(iv), and is different than the TUR metric used for the MPLX performance units, discussed in more detail beginning on page 46.
    
Total Shareholder Return Amount   $ 218.21 116.95 72.64
Peer Group Total Shareholder Return Amount   153.61 90.02 66.82
Net Income (Loss)   $ 16,050,000,000 $ 11,001,000,000 $ (9,977,000,000)
Company Selected Measure Amount   83.33 91.67 90
PEO Name   •2022 and 2021: Michael J. Hennigan.•2020: Michael J. Hennigan (top row), who was promoted to the CEO role effective March 17, 2020, and Gary R. Heminger (bottom row), who stepped down from the CEO role on that date but continued to serve in his role as Chairman of the Board through April 29, 2020.    
Measure [Axis]: 1        
Pay vs Performance Disclosure [Table]        
Measure Name   MPC Relative TSR Performance Percentile    
Measure [Axis]: 2        
Pay vs Performance Disclosure [Table]        
Measure Name   MPC TSR    
Measure [Axis]: 3        
Pay vs Performance Disclosure [Table]        
Measure Name   MPLX Total Unitholder Return*    
Measure [Axis]: 4        
Pay vs Performance Disclosure [Table]        
Measure Name   MPC Adjusted EBITDA    
PEO [Member] | Change in pension value and grant date fair value of equity-based awards granted [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 6,000,009 $ 14,521,516 $ 14,636,291 $ 10,532,443
PEO [Member] | Pension service cost [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 0 374,531 292,772 234,235
PEO [Member] | Change in value of equity awards [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount $ 6,064,560 50,721,670 24,235,054 15,982,957
Non-PEO NEO [Member] | Change in pension value and grant date fair value of equity-based awards granted [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount   2,890,901 4,130,399 3,309,326
Non-PEO NEO [Member] | Pension service cost [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount   94,246 99,299 164,855
Non-PEO NEO [Member] | Change in value of equity awards [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount   $ 9,725,214 $ 4,364,573 $ 2,617,776