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Property, Plant And Equipment - Summary Of Property, Plant And Equipment (Detail) - USD ($) $ in Millions | Feb. 01, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, gross |  | $ 41,176 |  | $ 40,538
Less accumulated depreciation |  | 14,558 |  | 14,095
Property, plant and equipment, net |  | 26,618 |  | 26,443
Refining & Marketing |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, transfers | $ (830) |  |  |
Midstream |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, transfers | $ 830 |  |  |
Operating Segments | Refining & Marketing |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, gross |  | 18,117 | [1] | 19,490
Operating Segments | Speedway |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, gross |  | 5,359 |  | 5,358
Operating Segments | Midstream |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, gross |  | 16,889 | [1] | 14,898
Corporate and Other |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, gross |  | $ 811 |  | $ 792
[1] | On February 1, 2018, we contributed certain refining logistics assets and fuels distribution services to MPLX. In connection with this transaction, approximately $830 million of net property, plant and equipment was recorded to the Midstream segment with an offsetting reduction to the Refining & Marketing segment.

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