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Property, Plant and Equipment | 3 Months Ended
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Mar. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment
(In millions) | March 31, 2018 |  | December 31, 2017
Refining & Marketing(a) | $ | 18,117 |  |  | $ | 19,490 |
Speedway | 5,359 |  |  | 5,358 |
Midstream(a) | 16,889 |  |  | 14,898 |
Corporate and Other | 811 |  |  | 792 |
Total | 41,176 |  |  | 40,538 |
Less accumulated depreciation | 14,558 |  |  | 14,095 |
Property, plant and equipment, net | $ | 26,618 |  |  | $ | 26,443 |
(a) | 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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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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