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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Net income (loss) | $ 99 | $ 55 | $ (176) | $ 194
Other comprehensive income (loss), net of tax |  |  |  |
Foreign currency translation adjustment, net of tax provision (benefit) of $2, $(4), $(2) and $(1) | (109) | 54 | (50) | (15)
Unrealized holding gains (losses) arising during the period, net of tax provision (benefit) of $—, $—, $— and $— | (1) |  | (1) |
Derivatives: net investment hedges |  |  |  |
(Gains) losses reclassified to interest expense, net of tax provision of $1, $—, $1 and $— | (1) |  | (3) |
Pension and other postretirement benefit liability adjustments |  |  |  |
Amortization of net loss and prior service credit included in net periodic benefit cost, net of tax |  |  |  | 2
Other comprehensive income (loss) | (111) | 54 | (54) | (13)
Comprehensive income (loss) | (12) | 109 | (230) | 181
Net income (loss) attributable to noncontrolling interests, net of tax | 11 | 8 | 31 | 18
Foreign currency translation adjustment attributable to noncontrolling interests, net of tax | (7) | 3 |  |
Comprehensive income (loss) attributable to noncontrolling interests, net of tax | 4 | 11 | 31 | 18
Comprehensive income (loss) attributable to Cabot Corporation | $ (16) | $ 98 | $ (261) | $ 163

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