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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 235 | $ 101
Defined benefit postretirement and post-employment plans: |  |
Actuarial changes, net of tax of $3 and $3 | 7 | 4
Prior service costs, net of tax of ($2) and ($4) | (7) | (7)
Other, net of tax of ($1) and $0 | (2) | 0
Other comprehensive loss | (2) | (3)
Comprehensive income | 233 | 98
Less comprehensive income attributable to: |  |
Redeemable noncontrolling interest | 16 | 16
Noncontrolling interests | 182 | 55
Comprehensive income attributable to MPC | $ 35 | $ 27

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