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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 2,303 | $ 2,121 | $ 1,638
Other comprehensive income: |  |  |
Foreign currency translation adjustments | 10 | (96) | 93
Income tax effect | 8 | (4) | 0
Foreign currency translation adjustment, net of income tax effect | 18 | (100) | 93
Pension and other postretirement benefit plans | 141 | (14) | 52
Income tax effect | (39) | 9 | (11)
Pension and other postretirement benefit plans, net of income tax effect | 102 | (5) | 41
Unrealized (loss) gain on investment and forward exchange contracts | (2) | 2 | (10)
Income tax effect | 0 | 0 | 0
Unrealized loss on investment and forward exchange contracts, net of income tax effect | (2) | 2 | (10)
Comprehensive income | 2,421 | 2,018 | 1,762
Less: comprehensive income attributable to nonredeemable noncontrolling interests | (10) | (12) | (13)
Less: comprehensive income attributable to redeemable noncontrolling interests | (170) | (151) | (129)
Comprehensive income attributable to S&P Global Inc. | $ 2,241 | $ 1,855 | $ 1,620

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