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Segment Information - Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Plus items not allocated to segments:        
Capital expenditures [1] $ 1,386 $ 841 $ 3,524 $ 2,389
Operating Segments        
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]        
Capital expenditures and investments [2] 1,521 917 4,175 2,514
Less investments in equity method investees 197 104 792 222
Corporate and Other        
Plus items not allocated to segments:        
Corporate 30 7 44 42
Capitalized interest $ 32 $ 21 $ 97 $ 55
[1]
Capital expenditures include changes in capital accruals. See Note 19 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the nine months ended September 30, 2019 and 2018 as reported in the consolidated statements of cash flows.
[2]
Capital expenditures include changes in capital accruals and investments in affiliates. See reconciliation from segment totals to MPC consolidated total capital expenditures below.