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Debt (Senior Notes) (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 08, 2018 | Mar. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 10, 2018 | Nov. 15, 2018 | Feb. 10, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of Debt, Gain (Loss), Net of Tax |  |  | $ 46 | $ 0 | $ 0 |  |  |
Ozark Pipeline |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Business Combination, Cash Consideration Transferred Net of Liabilities Assumed |  | $ 1,500 |  |  |  |  |  |
MPLX LP | MPLX 364-Day Term Loan [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of Short-term Debt | $ 4,100 |  |  |  |  |  |  |
MPLX LP | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross | $ 5,500 |  |  |  |  |  | $ 2,250 |
MPLX LP | Senior Notes | Senior Notes Due February 2029 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 750 | 0 |  |  |  |
Interest rate, stated percentage |  |  | 4.80% |  |  |  |  |
Percent of par |  |  |  |  |  |  | 99.432% |
MPLX LP | Senior Notes | Senior Notes Due February 2049 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 1,500 | 0 |  |  |  |
Interest rate, stated percentage |  |  | 5.50% |  |  |  |  |
Percent of par |  |  |  |  |  |  | 98.031% |
MPLX LP | Senior Notes | 5.500% senior notes due February 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 0 | 710 |  | $ 750 |  |
Interest rate, stated percentage |  |  | 5.50% |  |  | 5.50% |  |
Percent of par |  |  |  |  |  | 101.833% |  |
MPLX LP | Senior Notes | Senior Notes Due March 2023 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 500 | 0 |  |  |  |
Interest rate, stated percentage |  |  | 3.375% |  |  |  |  |
Percent of par | 99.931% |  |  |  |  |  |  |
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
Interest rate, stated percentage |  |  | 4.125% |  |  |  |  | 4.125%
Percent of par |  |  |  |  |  |  |  | 99.834%
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
Interest rate, stated percentage |  |  | 5.20% |  |  |  |  | 5.20%
Percent of par |  |  |  |  |  |  |  | 99.304%
MPLX LP | Senior Notes | Senior Notes Due March 2028 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 1,250 | 0 |  |  |  |
Interest rate, stated percentage |  |  | 4.00% |  |  |  |  |
Percent of par | 99.551% |  |  |  |  |  |  |
MPLX LP | Senior Notes | Senior Notes Due April 2038 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 1,750 | 0 |  |  |  |
Interest rate, stated percentage |  |  | 4.50% |  |  |  |  |
Percent of par | 98.811% |  |  |  |  |  |  |
MPLX LP | Senior Notes | Senior Notes Due April 2048 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 1,500 | 0 |  |  |  |
Interest rate, stated percentage |  |  | 4.70% |  |  |  |  |
Percent of par | 99.348% |  |  |  |  |  |  |
MPLX LP | Senior Notes | Senior Notes Due April 2058 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 500 | $ 0 |  |  |  |
Interest rate, stated percentage |  |  | 4.90% |  |  |  |  |
Percent of par | 99.289% |  |  |  |  |  |  |
MarkWest | Senior Notes | 5.500% senior notes due February 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  | $ 40 |  |
Debt Premium [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of Debt, Gain (Loss), Net of Tax |  |  | $ 14 |  |  |  |  |

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