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Property, Plant and Equipment
3 Months Ended
Mar. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
(In millions)
March 31,
2017
 
December 31, 2016(a)
Refining & Marketing
$
18,835

 
$
18,590

Speedway
5,105

 
5,078

Midstream
13,684

 
13,521

Corporate and Other
782

 
817

Total
38,406

 
38,006

Less accumulated depreciation
12,737

 
12,241

Property, plant and equipment, net
$
25,669

 
$
25,765


(a) 
Prior period balances have been recast in connection with the March 1, 2017 contribution of assets to MPLX. See Note 1 for additional information.