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Debt (Summary of Outstanding Borrowings) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 10, 2018	Nov. 15, 2018	Feb. 08, 2018	Dec. 31, 2017	Feb. 10, 2017
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 13,856				$ 7,362
Unamortized debt issuance costs	97				27
Unamortized discount	366				389
Amounts due within one year	1				1
Total long-term debt due after one year	13,392				6,945
MPLX LP | Line of Credit | MPLX Revolver due July 2022
Debt Instrument [Line Items]
Long-term debt, gross	0				505
MPLX LP | Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross			$ 2,250	$ 5,500
MPLX LP | Senior Notes | 5.500% senior notes due February 2023
Debt Instrument [Line Items]
Long-term debt, gross	0	$ 750			710
MPLX LP | Senior Notes | Senior Notes Due March 2023 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	500				0
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 | 4.875% senior notes due December 2024
Debt Instrument [Line Items]
Long-term debt, gross	1,149				1,149
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	$ 1,250
MPLX LP | Senior Notes | Senior Notes Due March 2028 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	1,250				0
MPLX LP | Senior Notes | Senior Notes Due February 2029 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	750				0
MPLX LP | Senior Notes | Senior Notes Due April 2038 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	1,750				0
MPLX LP | Senior Notes | 5.200% senior notes due March 2047
Debt Instrument [Line Items]
Long-term debt, gross	1,000				1,000	$ 1,000
MPLX LP | Senior Notes | Senior Notes Due April 2048 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	1,500				0
MPLX LP | Senior Notes | Senior Notes Due February 2049 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	1,500				0
MPLX LP | Senior Notes | Senior Notes Due April 2058 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	500				0
MarkWest | Senior Notes | 5.500% senior notes due February 2023
Debt Instrument [Line Items]
Long-term debt, gross		$ 40
MarkWest | Senior Notes | MarkWest senior notes
Debt Instrument [Line Items]
Long-term debt, gross	23				63
Marathon Pipe Line LLC | Capital Lease Obligations
Debt Instrument [Line Items]
Capital lease obligations due 2020	$ 6				$ 7

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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