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Debt Debt - Summary of Outstanding Borrowings - Interest Rates and Table Due Dates (Details) | 6 Months Ended
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Jun. 30, 2017
MarkWest [Member] | Senior Notes [Member] | 5.500% senior notes due February 2023 |
Debt Instrument [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 5.50%
Debt Instrument, Maturity Date | Feb. 15, 2023
MarkWest [Member] | Senior Notes [Member] | 4.500% senior notes due July 2023 |
Debt Instrument [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 4.50%
Debt Instrument, Maturity Date | Jul. 15, 2023
MarkWest [Member] | Senior Notes [Member] | 4.875% senior notes due December 2024 |
Debt Instrument [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 4.875%
Debt Instrument, Maturity Date | Dec. 01, 2024
MarkWest [Member] | Senior Notes [Member] | 4.875% senior notes due June 2025 |
Debt Instrument [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 4.875%
Debt Instrument, Maturity Date | Jun. 01, 2025
Mplx Lp [Member] | Line of Credit [Member] | Bank revolving credit facility due 2020 |
Debt Instrument [Line Items] |
Line of Credit Facility, Expiration Date | Dec. 04, 2020
Mplx Lp [Member] | Unsecured Debt [Member] | Term loan facility due 2019 |
Debt Instrument [Line Items] |
Line of Credit Facility, Expiration Date | Nov. 20, 2019
Mplx Lp [Member] | Senior Notes [Member] | 5.500% senior notes due February 2023 |
Debt Instrument [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 5.50%
Debt Instrument, Maturity Date | Feb. 15, 2023
Mplx Lp [Member] | Senior Notes [Member] | 4.500% senior notes due July 2023 |
Debt Instrument [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 4.50%
Debt Instrument, Maturity Date | Jul. 15, 2023
Mplx Lp [Member] | Senior Notes [Member] | 4.875% senior notes due December 2024 |
Debt Instrument [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 4.875%
Debt Instrument, Maturity Date | Dec. 01, 2024
Mplx Lp [Member] | Senior Notes [Member] | 4.000% senior notes due February 2025 |
Debt Instrument [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 4.00%
Debt Instrument, Maturity Date | Feb. 15, 2025
Mplx Lp [Member] | Senior Notes [Member] | 4.875% senior notes due June 2025 |
Debt Instrument [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 4.875%
Debt Instrument, Maturity Date | Jun. 01, 2025
Marathon Pipe Line Llc [Member] | Capital Lease Obligations [Member] |
Debt Instrument [Line Items] |
Capital Lease Due Date Year | 2020

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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