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Debt (Summary of Outstanding Borrowings) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Sep. 30, 2019
Sep. 23, 2019
Sep. 09, 2019
Jul. 30, 2019
Dec. 31, 2018
Nov. 15, 2018
Oct. 01, 2018
Feb. 08, 2018
Debt Instrument [Line Items]                  
Finance Lease, Liability $ 19                
Debt and capital lease obligations 20,119         $ 18,866      
Unamortized debt issuance costs 106         97      
Unamortized discount 300         334      
Amounts due within one year 9         513      
Total long-term debt due after one year 19,704         17,922      
MPLX Revolving Credit Facility due July 2024 [Member]                  
Debt Instrument [Line Items]                  
Outstanding balance 0         0      
Term loan facility due 2019                  
Debt Instrument [Line Items]                  
Outstanding balance 1,000         0      
Senior Notes                  
Debt Instrument [Line Items]                  
Long-term debt, gross       $ 2,000          
Senior Notes | Floating Rate Senior Notes Due September 2021 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross 1,000     1,000   0      
Senior Notes | Floating Rate Senior Notes Due September 2022 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross 1,000     $ 1,000   0      
MPLX LP | Line of Credit | MPLX Revolving Credit Facility due July 2024 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross 0                
MPLX LP | Senior Notes                  
Debt Instrument [Line Items]                  
Long-term debt, gross     $ 3,060       $ 2,250   $ 5,500
MPLX LP | Senior Notes | Senior Notes Due October 2022 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross 266   266     0      
MPLX LP | Senior Notes | Senior Notes Due December 2022 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross 486   486     0      
MPLX LP | Senior Notes | Senior Notes Due March 2023 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross 500         500      
MPLX LP | Senior Notes | 4.500% senior notes due July 2023                  
Debt Instrument [Line Items]                  
Long-term debt, gross 989         989      
MPLX LP | Senior Notes | Senior Notes Due May 2024 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross 381   381     0      
MPLX LP | Senior Notes | 4.875% senior notes due December 2024                  
Debt Instrument [Line Items]                  
Long-term debt, gross 1,149         1,149      
MPLX LP | Senior Notes | Senior Notes Due January 2025 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross 708   708     0      
MPLX LP | Senior Notes | 4.000% senior notes due February 2025                  
Debt Instrument [Line Items]                  
Long-term debt, gross 500         500      
MPLX LP | Senior Notes | 4.875% senior notes due June 2025                  
Debt Instrument [Line Items]                  
Long-term debt, gross 1,189         1,189      
MPLX LP | Senior Notes | 4.125% senior notes due March 2027                  
Debt Instrument [Line Items]                  
Long-term debt, gross 1,250         1,250      
MPLX LP | Senior Notes | Senior Notes Due December 2027 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross 732   732     0      
MPLX LP | Senior Notes | Senior Notes Due March 2028 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross 1,250         1,250      
MPLX LP | Senior Notes | Senior Notes Due February 2029 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross 750         750      
MPLX LP | Senior Notes | Senior Notes Due April 2038 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross 1,750         1,750      
MPLX LP | Senior Notes | 5.200% senior notes due March 2047                  
Debt Instrument [Line Items]                  
Long-term debt, gross 1,000         1,000      
MPLX LP | Senior Notes | Senior Notes Due December 2047 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross 487   487     0      
MPLX LP | Senior Notes | Senior Notes Due April 2048 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross 1,500         1,500      
MPLX LP | Senior Notes | Senior Notes Due February 2049 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross 1,500         1,500      
MPLX LP | Senior Notes | Senior Notes Due April 2058 [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross 500         500      
MarkWest | Senior Notes | MarkWest senior notes                  
Debt Instrument [Line Items]                  
Long-term debt, gross 23         23      
ANDX LP [Member] | Senior Notes                  
Debt Instrument [Line Items]                  
Long-term debt, gross 190 $ 690 $ 3,060   $ 3,750 3,750      
Andeavor Logistics [Member] | ANDX Bank Revolving Credit Facilities [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross           1,200   $ 1,100  
Outstanding balance 0         1,245      
Marathon Pipe Line LLC | Finance Lease [Member]                  
Debt Instrument [Line Items]                  
Finance Lease, Liability [1] $ 19         $ 21      
[1]
See Note 22 for lease information.