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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net income $ 1,235 $ 574 $ 1,470 $ 675
Defined benefit postretirement and post-employment plans:        
Actuarial changes, net of tax of $2, $4, $5 and $7, respectively 7 7 14 11
Prior service costs, net of tax of ($2), ($4), ($4) and ($8), respectively (7) (6) (14) (13)
Other, net of tax of $0, $0, ($1) and $0, respectively 0 0 (2) 0
Other comprehensive income (loss) 0 1 (2) (2)
Comprehensive income 1,235 575 1,468 673
Less comprehensive income attributable to:        
Redeemable noncontrolling interest 20 17 36 33
Noncontrolling interests 160 74 342 129
Comprehensive income attributable to MPC $ 1,055 $ 484 $ 1,090 $ 511