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Summary of Principal Accounting Policies (Principal Accounting Policies) (Details)
Dec. 31, 2024
Dec. 31, 2023
Refining and midstream assets | Minimum    
Estimated useful lives (in years) 10 years  
Refining and midstream assets | Maximum    
Estimated useful lives (in years) 40 years  
Office building    
Estimated useful lives (in years) 25 years  
Other miscellaneous fixed assets | Minimum    
Estimated useful lives (in years) 4 years  
Other miscellaneous fixed assets | Maximum    
Estimated useful lives (in years) 7 years  
MPC | MPLX    
MPC's partnership interest in MLPs (in percentage) 64.00% 65.00%