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Summary of Principal Accounting Policies (Principal Accounting Policies) (Details)
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) 65.00%