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MPLX LP - Reorganization Transactions (Details) - MPLX LP - USD ($) shares in Millions, $ in Millions	Mar. 01, 2017	Sep. 01, 2016	Mar. 31, 2016
General partners' contributed capital		$ 225
Limited Partner
Units issued, number of units	13	7	23
General Partner and Limited Partner
Increase in ownership percentage by MPC		1.00%

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-Publisher FASB
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-SubTopic 30
-Section 50
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-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

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