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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 1,367 | $ 941 | $ 2,993 | $ 2,411
Defined benefit plans: |  |  |  |
Actuarial changes, net of tax of ($14), $24, ($8) and $29, respectively | (42) | 75 | (46) | 89
Prior service credit, net of tax of ($3), ($3), ($14) and ($7), respectively | (8) | (7) | (19) | (21)
Other, net of tax of $0, ($1), ($1) and ($2), respectively | (1) | (3) | (3) | (5)
Other comprehensive income (loss) | (51) | 65 | (68) | 63
Comprehensive income | 1,316 | 1,006 | 2,925 | 2,474
Less comprehensive income attributable to: |  |  |  |
Redeemable noncontrolling interest | 20 | 19 | 61 | 55
Noncontrolling interests | 252 | 185 | 738 | 527
Comprehensive income attributable to MPC | $ 1,044 | $ 802 | $ 2,126 | $ 1,892

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