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Debt (Tables) | 12 Months Ended
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Dec. 31, 2018
Extinguishment of Debt [Line Items] |
Schedule of Extinguishment of Debt [Table Text Block] | On December 10, 2018, MPLX redeemed all of the $750 million 5.5 percent senior notes due February 15, 2023, $40 million of which was issued by the MarkWest subsidiary. These notes were redeemed at 101.833 percent of the principal amount, which resulted in a payment of $14 million related to the note premium and the immediate recognition of $46 million of unamortized debt issuance costs.
Summary of Outstanding Borrowings | MPLX’s outstanding borrowings at December 31, 2018 and 2017 consisted of the following:
|  | December 31,
(In millions) |  | 2018 |  | 2017
MPLX LP: |  |  |  |
Bank revolving credit facility due 2022 |  | $ | — |  |  | $ | 505 |
5.500% senior notes due February 2023 |  | — |  |  | 710 |
3.375% senior notes due March 2023 |  | 500 |  |  | — |
4.500% senior notes due July 2023 |  | 989 |  |  | 989 |
4.875% senior notes due December 2024 |  | 1,149 |  |  | 1,149 |
4.000% senior notes due February 2025 |  | 500 |  |  | 500 |
4.875% senior notes due June 2025 |  | 1,189 |  |  | 1,189 |
4.125% senior notes due March 2027 |  | 1,250 |  |  | 1,250 |
4.000% senior notes due March 2028 |  | 1,250 |  |  | — |
4.800% senior notes due February 2029 |  | 750 |  |  | — |
4.500% senior notes due April 2038 |  | 1,750 |  |  | — |
5.200% senior notes due March 2047 |  | 1,000 |  |  | 1,000 |
4.700% senior notes due April 2048 |  | 1,500 |  |  | — |
5.500% senior notes due February 2049 |  | 1,500 |  |  | — |
4.900% senior notes due April 2058 |  | 500 |  |  | — |
Consolidated subsidiaries: |  |  |  |
MarkWest - 4.500% - 4.875% senior notes, due 2023-2025 |  | 23 |  |  | 63 |
Capital lease obligations due 2020 |  | 6 |  |  | 7 |
Total |  | 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 |
Schedule of Debt Payments | The following table shows five years of scheduled debt payments.
(In millions) |  |
2019 |  | $ | 1 |
2020 |  | 5 |
2021 |  | — |
2022 |  | — |
2023 |  | $ | 1,500 |
Schedule of interest payable dates | Interest on each series of MPLX LP and MarkWest senior notes is payable semi-annually in arrears, according to the table below.
Senior Notes |  | Interest payable semi-annually in arrears
3.375% senior notes due 2023 |  | March 15 th and September 15 th
4.500% senior notes due 2023 |  | January 15 th and July 15 th
4.875% senior notes due 2024 |  | June 1 st and December 1 st
4.000% senior notes due 2025 |  | February 15 th and August 15 th
4.875% senior notes due 2025 |  | June 1 st and December 1 st
4.125% senior notes due 2027 |  | March 1 st and September 1 st
4.000% senior notes due 2028 |  | March 15 th and September 15 th
4.800% senior notes due 2029 |  | February 15 th and August 15 th
4.500% senior notes due 2038 |  | April 15 th and October 15 th
5.200% senior notes due 2047 |  | March 1 st and September 1 st
4.700% senior notes due 2048 |  | April 15 th and October 15 th
5.500% senior notes due 2049 |  | February 15 th and August 15 th
4.900% senior notes due 2058 |  | April 15 th and October 15 th
Schedule of amounts related to the SMR included in the Balance Sheet | As of December 31, 2018 and 2017, the following amounts related to the SMR are included in the accompanying Consolidated Balance Sheets:
(In millions) |  | December 31, 2018 |  | December 31, 2017
Assets |  |  |  |
Property, plant and equipment, net |  | $ | 51 |  |  | $ | 56 |
Liabilities |  |  |  |
Accrued liabilities |  | 5 |  |  | 5 |
Deferred credits and other liabilities |  | $ | 81 |  |  | $ | 86 |

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